Jan  8 15:51:38 ermintrude kernel: [81479.150851] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 00 01 00 02 02 06 00 00 00 00
Jan  8 15:51:38 ermintrude kernel: [81479.151119] [drm:intel_dp_detect [i915]] Display Port TPS3 support: source yes, sink yes
Jan  8 15:51:38 ermintrude kernel: [81479.151130] [drm:intel_dp_print_rates [i915]] source rates: 162000, 216000, 270000, 324000, 432000, 540000
Jan  8 15:51:38 ermintrude kernel: [81479.151140] [drm:intel_dp_print_rates [i915]] sink rates: 162000, 270000, 540000
Jan  8 15:51:38 ermintrude kernel: [81479.151150] [drm:intel_dp_print_rates [i915]] common rates: 162000, 270000, 540000
Jan  8 15:51:38 ermintrude kernel: [81479.151508] [drm:intel_dp_read_desc [i915]] DP sink: OUI 00-00-00(NS) dev-ID  HW-rev 0.0 SW-rev 0.0
Jan  8 15:51:38 ermintrude kernel: [81479.151774] [drm:intel_dp_detect [i915]] Sink is not MST capable
Jan  8 15:51:38 ermintrude kernel: [81479.157495] [drm:drm_detect_monitor_audio [drm]] Monitor has basic audio support
Jan  8 15:51:38 ermintrude kernel: [81479.157765] [drm:i915_hotplug_work_func [i915]] [CONNECTOR:54:DP-2] status updated from disconnected to connected
Jan  8 15:51:38 ermintrude kernel: [81479.157775] [drm:i915_hotplug_work_func [i915]] Connector HDMI-A-2 (pin 6) received hotplug event.
Jan  8 15:51:38 ermintrude kernel: [81479.157786] [drm:intel_hdmi_detect [i915]] [CONNECTOR:58:HDMI-A-2]
Jan  8 15:51:38 ermintrude kernel: [81479.159910] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.159920] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.162036] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.162049] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpc
Jan  8 15:51:38 ermintrude kernel: [81479.164166] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.164176] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.166293] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.166298] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID:  (err -6)
Jan  8 15:51:38 ermintrude kernel: [81479.166335] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:51:HDMI-A-1]
Jan  8 15:51:38 ermintrude kernel: [81479.166346] [drm:intel_hdmi_detect [i915]] [CONNECTOR:51:HDMI-A-1]
Jan  8 15:51:38 ermintrude kernel: [81479.168468] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.168479] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.170606] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.170620] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpb
Jan  8 15:51:38 ermintrude kernel: [81479.172608] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.172618] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.174735] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.174739] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID:  (err -6)
Jan  8 15:51:38 ermintrude kernel: [81479.174743] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:51:HDMI-A-1] disconnected
Jan  8 15:51:38 ermintrude kernel: [81479.174759] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:54:DP-2]
Jan  8 15:51:38 ermintrude kernel: [81479.174770] [drm:intel_dp_detect [i915]] [CONNECTOR:54:DP-2]
Jan  8 15:51:38 ermintrude kernel: [81479.175160] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 00 01 00 02 02 06 00 00 00 00
Jan  8 15:51:38 ermintrude kernel: [81479.175427] [drm:intel_dp_detect [i915]] Display Port TPS3 support: source yes, sink yes
Jan  8 15:51:38 ermintrude kernel: [81479.175438] [drm:intel_dp_print_rates [i915]] source rates: 162000, 216000, 270000, 324000, 432000, 540000
Jan  8 15:51:38 ermintrude kernel: [81479.175447] [drm:intel_dp_print_rates [i915]] sink rates: 162000, 270000, 540000
Jan  8 15:51:38 ermintrude kernel: [81479.175457] [drm:intel_dp_print_rates [i915]] common rates: 162000, 270000, 540000
Jan  8 15:51:38 ermintrude kernel: [81479.175815] [drm:intel_dp_read_desc [i915]] DP sink: OUI 00-00-00(NS) dev-ID  HW-rev 0.0 SW-rev 0.0
Jan  8 15:51:38 ermintrude kernel: [81479.176082] [drm:intel_dp_detect [i915]] Sink is not MST capable
Jan  8 15:51:38 ermintrude kernel: [81479.176390] [drm:intel_dp_check_link_status [i915]] DDI C: channel EQ not ok, retraining
Jan  8 15:51:38 ermintrude kernel: [81479.177276] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 00000000
Jan  8 15:51:38 ermintrude kernel: [81479.177286] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 0
Jan  8 15:51:38 ermintrude kernel: [81479.177295] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
Jan  8 15:51:38 ermintrude kernel: [81479.177304] [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS1
Jan  8 15:51:38 ermintrude kernel: [81479.177874] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 04000000
Jan  8 15:51:38 ermintrude kernel: [81479.177883] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 1
Jan  8 15:51:38 ermintrude kernel: [81479.177892] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
Jan  8 15:51:38 ermintrude kernel: [81479.178451] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 07000000
Jan  8 15:51:38 ermintrude kernel: [81479.178460] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
Jan  8 15:51:38 ermintrude kernel: [81479.178469] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
Jan  8 15:51:38 ermintrude kernel: [81479.179029] [drm:intel_dp_start_link_train [i915]] clock recovery OK
Jan  8 15:51:38 ermintrude kernel: [81479.179038] [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS3
Jan  8 15:51:38 ermintrude kernel: [81479.179905] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 08000000
Jan  8 15:51:38 ermintrude kernel: [81479.179914] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
Jan  8 15:51:38 ermintrude kernel: [81479.179923] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
Jan  8 15:51:38 ermintrude kernel: [81479.180781] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 08000000
Jan  8 15:51:38 ermintrude kernel: [81479.180790] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
Jan  8 15:51:38 ermintrude kernel: [81479.180799] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
Jan  8 15:51:38 ermintrude kernel: [81479.181657] [drm:intel_dp_start_link_train [i915]] Channel EQ done. DP Training successful
Jan  8 15:51:38 ermintrude kernel: [81479.185379] [drm:drm_add_edid_modes [drm]] HDMI: DVI dual 1, max TMDS clock 600000 kHz
Jan  8 15:51:38 ermintrude kernel: [81479.185386] [drm:drm_edid_to_eld [drm]] ELD monitor U2879G6
Jan  8 15:51:38 ermintrude kernel: [81479.185392] [drm:drm_edid_to_eld [drm]] HDMI: latency present 0 0, video latency 0 1, audio latency 96 2
Jan  8 15:51:38 ermintrude kernel: [81479.185404] [drm:intel_connector_update_modes [i915]] ELD size 32, SAD count 1
Jan  8 15:51:38 ermintrude kernel: [81479.185430] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:54:DP-2] probed modes :
Jan  8 15:51:38 ermintrude kernel: [81479.185437] [drm:drm_mode_debug_printmodeline [drm]] Modeline 69:"3840x2160" 60 533250 3840 3888 3920 4000 2160 2163 2168 2222 0x48 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.185444] [drm:drm_mode_debug_printmodeline [drm]] Modeline 132:"3840x2160" 30 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185449] [drm:drm_mode_debug_printmodeline [drm]] Modeline 163:"3840x2160" 30 296703 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185455] [drm:drm_mode_debug_printmodeline [drm]] Modeline 70:"3840x2160" 30 262750 3840 3888 3920 4000 2160 2163 2168 2191 0x40 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.185460] [drm:drm_mode_debug_printmodeline [drm]] Modeline 133:"3840x2160" 25 297000 3840 4896 4984 5280 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185465] [drm:drm_mode_debug_printmodeline [drm]] Modeline 139:"3840x2160" 24 297000 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185470] [drm:drm_mode_debug_printmodeline [drm]] Modeline 164:"3840x2160" 24 296703 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185474] [drm:drm_mode_debug_printmodeline [drm]] Modeline 71:"1920x2160" 60 277250 1920 1968 2000 2080 2160 2163 2173 2222 0x40 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.185479] [drm:drm_mode_debug_printmodeline [drm]] Modeline 75:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185484] [drm:drm_mode_debug_printmodeline [drm]] Modeline 94:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185488] [drm:drm_mode_debug_printmodeline [drm]] Modeline 151:"1920x1080" 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185493] [drm:drm_mode_debug_printmodeline [drm]] Modeline 117:"1920x1080i" 60 74250 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.185498] [drm:drm_mode_debug_printmodeline [drm]] Modeline 162:"1920x1080i" 60 74176 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.185503] [drm:drm_mode_debug_printmodeline [drm]] Modeline 95:"1920x1080" 50 148500 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185507] [drm:drm_mode_debug_printmodeline [drm]] Modeline 118:"1920x1080i" 50 74250 1920 2448 2492 2640 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.185512] [drm:drm_mode_debug_printmodeline [drm]] Modeline 79:"1680x1050" 60 146250 1680 1784 1960 2240 1050 1053 1059 1089 0x40 0x6
Jan  8 15:51:38 ermintrude kernel: [81479.185517] [drm:drm_mode_debug_printmodeline [drm]] Modeline 87:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185521] [drm:drm_mode_debug_printmodeline [drm]] Modeline 76:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185526] [drm:drm_mode_debug_printmodeline [drm]] Modeline 78:"1440x900" 60 106500 1440 1520 1672 1904 900 903 909 934 0x40 0x6
Jan  8 15:51:38 ermintrude kernel: [81479.185530] [drm:drm_mode_debug_printmodeline [drm]] Modeline 77:"1280x960" 60 108000 1280 1376 1488 1800 960 961 964 1000 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185535] [drm:drm_mode_debug_printmodeline [drm]] Modeline 72:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185540] [drm:drm_mode_debug_printmodeline [drm]] Modeline 140:"1280x720" 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185547] [drm:drm_mode_debug_printmodeline [drm]] Modeline 97:"1280x720" 50 74250 1280 1720 1760 1980 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185552] [drm:drm_mode_debug_printmodeline [drm]] Modeline 88:"1024x768" 75 78750 1024 1040 1136 1312 768 769 772 800 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185557] [drm:drm_mode_debug_printmodeline [drm]] Modeline 89:"1024x768" 70 75000 1024 1048 1184 1328 768 771 777 806 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185561] [drm:drm_mode_debug_printmodeline [drm]] Modeline 90:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185566] [drm:drm_mode_debug_printmodeline [drm]] Modeline 91:"832x624" 75 57284 832 864 928 1152 624 625 628 667 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185570] [drm:drm_mode_debug_printmodeline [drm]] Modeline 92:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185575] [drm:drm_mode_debug_printmodeline [drm]] Modeline 93:"800x600" 72 50000 800 856 976 1040 600 637 643 666 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185580] [drm:drm_mode_debug_printmodeline [drm]] Modeline 80:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185584] [drm:drm_mode_debug_printmodeline [drm]] Modeline 81:"800x600" 56 36000 800 824 896 1024 600 601 603 625 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.185589] [drm:drm_mode_debug_printmodeline [drm]] Modeline 73:"720x576" 50 27000 720 732 796 864 576 581 586 625 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185593] [drm:drm_mode_debug_printmodeline [drm]] Modeline 141:"720x480" 60 27027 720 736 798 858 480 489 495 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185598] [drm:drm_mode_debug_printmodeline [drm]] Modeline 74:"720x480" 60 27000 720 736 798 858 480 489 495 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185603] [drm:drm_mode_debug_printmodeline [drm]] Modeline 82:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185607] [drm:drm_mode_debug_printmodeline [drm]] Modeline 83:"640x480" 73 31500 640 664 704 832 480 489 492 520 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185612] [drm:drm_mode_debug_printmodeline [drm]] Modeline 84:"640x480" 67 30240 640 704 768 864 480 483 486 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185616] [drm:drm_mode_debug_printmodeline [drm]] Modeline 147:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185621] [drm:drm_mode_debug_printmodeline [drm]] Modeline 85:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.185625] [drm:drm_mode_debug_printmodeline [drm]] Modeline 86:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
Jan  8 15:51:38 ermintrude kernel: [81479.185723] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:58:HDMI-A-2]
Jan  8 15:51:38 ermintrude kernel: [81479.185735] [drm:intel_hdmi_detect [i915]] [CONNECTOR:58:HDMI-A-2]
Jan  8 15:51:38 ermintrude kernel: [81479.187853] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.187864] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.189982] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.190005] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpc
Jan  8 15:51:38 ermintrude kernel: [81479.192122] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.192132] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.194250] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.194254] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID:  (err -6)
Jan  8 15:51:38 ermintrude kernel: [81479.194257] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:58:HDMI-A-2] disconnected
Jan  8 15:51:38 ermintrude kernel: [81479.194273] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:60:DP-3]
Jan  8 15:51:38 ermintrude kernel: [81479.194292] [drm:intel_dp_detect [i915]] [CONNECTOR:60:DP-3]
Jan  8 15:51:38 ermintrude kernel: [81479.194689] [drm:intel_dp_read_dpcd [i915]] DPCD: 11 0a a4 01 01 00 01 81 00 00 00 00 00 00 00
Jan  8 15:51:38 ermintrude kernel: [81479.194970] [drm:intel_dp_detect [i915]] Display Port TPS3 support: source yes, sink no
Jan  8 15:51:38 ermintrude kernel: [81479.194981] [drm:intel_dp_print_rates [i915]] source rates: 162000, 216000, 270000, 324000, 432000, 540000
Jan  8 15:51:38 ermintrude kernel: [81479.194990] [drm:intel_dp_print_rates [i915]] sink rates: 162000, 270000
Jan  8 15:51:38 ermintrude kernel: [81479.195000] [drm:intel_dp_print_rates [i915]] common rates: 162000, 270000
Jan  8 15:51:38 ermintrude kernel: [81479.195365] [drm:intel_dp_read_desc [i915]] DP sink: OUI 00-80-e1 dev-ID Dp1.2 HW-rev 0.0 SW-rev 0.0
Jan  8 15:51:38 ermintrude kernel: [81479.195375] [drm:intel_dp_detect [i915]] Sink is not MST capable
Jan  8 15:51:38 ermintrude kernel: [81479.195696] [drm:do_detailed_mode [drm]] composite sync not supported
Jan  8 15:51:38 ermintrude kernel: [81479.195763] [drm:drm_add_edid_modes [drm]] HDMI: DVI dual 0, max TMDS clock 300000 kHz
Jan  8 15:51:38 ermintrude kernel: [81479.195769] [drm:drm_edid_to_eld [drm]] ELD monitor DELL P2815Q
Jan  8 15:51:38 ermintrude kernel: [81479.195775] [drm:drm_edid_to_eld [drm]] HDMI: latency present 0 0, video latency 0 3, audio latency 96 2
Jan  8 15:51:38 ermintrude kernel: [81479.195786] [drm:intel_connector_update_modes [i915]] ELD size 36, SAD count 1
Jan  8 15:51:38 ermintrude kernel: [81479.195822] [drm:drm_mode_debug_printmodeline [drm]] Modeline 177:"720x480i" 0 13500 720 739 801 858 480 488 494 525 0x40 0x101a
Jan  8 15:51:38 ermintrude kernel: [81479.195828] [drm:drm_mode_prune_invalid [drm]] Not using 720x480i mode: H_ILLEGAL
Jan  8 15:51:38 ermintrude kernel: [81479.195834] [drm:drm_mode_debug_printmodeline [drm]] Modeline 178:"720x576i" 0 13500 720 732 795 864 576 580 586 625 0x40 0x101a
Jan  8 15:51:38 ermintrude kernel: [81479.195840] [drm:drm_mode_prune_invalid [drm]] Not using 720x576i mode: H_ILLEGAL
Jan  8 15:51:38 ermintrude kernel: [81479.195846] [drm:drm_mode_debug_printmodeline [drm]] Modeline 200:"720x480i" 60 13514 720 739 801 858 480 488 494 525 0x40 0x101a
Jan  8 15:51:38 ermintrude kernel: [81479.195851] [drm:drm_mode_prune_invalid [drm]] Not using 720x480i mode: H_ILLEGAL
Jan  8 15:51:38 ermintrude kernel: [81479.195856] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:60:DP-3] probed modes :
Jan  8 15:51:38 ermintrude kernel: [81479.195862] [drm:drm_mode_debug_printmodeline [drm]] Modeline 98:"3840x2160" 30 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x48 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195867] [drm:drm_mode_debug_printmodeline [drm]] Modeline 148:"3840x2160" 30 296703 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195872] [drm:drm_mode_debug_printmodeline [drm]] Modeline 146:"3840x2160" 25 297000 3840 4896 4984 5280 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195878] [drm:drm_mode_debug_printmodeline [drm]] Modeline 145:"3840x2160" 24 297000 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195883] [drm:drm_mode_debug_printmodeline [drm]] Modeline 161:"3840x2160" 24 296703 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195887] [drm:drm_mode_debug_printmodeline [drm]] Modeline 100:"2560x1440" 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.195892] [drm:drm_mode_debug_printmodeline [drm]] Modeline 115:"1920x1200" 60 154000 1920 1968 2000 2080 1200 1203 1209 1235 0x40 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.195897] [drm:drm_mode_debug_printmodeline [drm]] Modeline 99:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195901] [drm:drm_mode_debug_printmodeline [drm]] Modeline 149:"1920x1080" 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195906] [drm:drm_mode_debug_printmodeline [drm]] Modeline 137:"1920x1080i" 60 74250 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.195911] [drm:drm_mode_debug_printmodeline [drm]] Modeline 157:"1920x1080i" 60 74176 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.195915] [drm:drm_mode_debug_printmodeline [drm]] Modeline 128:"1920x1080" 50 148500 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195920] [drm:drm_mode_debug_printmodeline [drm]] Modeline 136:"1920x1080i" 50 74250 1920 2448 2492 2640 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.195924] [drm:drm_mode_debug_printmodeline [drm]] Modeline 144:"1920x1080" 30 74250 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195929] [drm:drm_mode_debug_printmodeline [drm]] Modeline 160:"1920x1080" 30 74176 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195934] [drm:drm_mode_debug_printmodeline [drm]] Modeline 143:"1920x1080" 25 74250 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195938] [drm:drm_mode_debug_printmodeline [drm]] Modeline 142:"1920x1080" 24 74250 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195943] [drm:drm_mode_debug_printmodeline [drm]] Modeline 159:"1920x1080" 24 74176 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195948] [drm:drm_mode_debug_printmodeline [drm]] Modeline 113:"1600x1200" 60 162000 1600 1664 1856 2160 1200 1201 1204 1250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195952] [drm:drm_mode_debug_printmodeline [drm]] Modeline 114:"1680x1050" 60 119000 1680 1728 1760 1840 1050 1053 1059 1080 0x40 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.195957] [drm:drm_mode_debug_printmodeline [drm]] Modeline 123:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195961] [drm:drm_mode_debug_printmodeline [drm]] Modeline 112:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195966] [drm:drm_mode_debug_printmodeline [drm]] Modeline 102:"1280x800" 60 71000 1280 1328 1360 1440 800 803 809 823 0x40 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.195970] [drm:drm_mode_debug_printmodeline [drm]] Modeline 101:"1152x864" 75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195975] [drm:drm_mode_debug_printmodeline [drm]] Modeline 134:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195980] [drm:drm_mode_debug_printmodeline [drm]] Modeline 156:"1280x720" 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195984] [drm:drm_mode_debug_printmodeline [drm]] Modeline 135:"1280x720" 50 74250 1280 1720 1760 1980 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195989] [drm:drm_mode_debug_printmodeline [drm]] Modeline 124:"1024x768" 75 78750 1024 1040 1136 1312 768 769 772 800 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.195993] [drm:drm_mode_debug_printmodeline [drm]] Modeline 125:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.195998] [drm:drm_mode_debug_printmodeline [drm]] Modeline 126:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.196002] [drm:drm_mode_debug_printmodeline [drm]] Modeline 119:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.196007] [drm:drm_mode_debug_printmodeline [drm]] Modeline 138:"720x576" 50 27000 720 732 796 864 576 581 586 625 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.196011] [drm:drm_mode_debug_printmodeline [drm]] Modeline 153:"720x480" 60 27027 720 736 798 858 480 489 495 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.196015] [drm:drm_mode_debug_printmodeline [drm]] Modeline 130:"720x480" 60 27000 720 736 798 858 480 489 495 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.196020] [drm:drm_mode_debug_printmodeline [drm]] Modeline 120:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.196024] [drm:drm_mode_debug_printmodeline [drm]] Modeline 150:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.196029] [drm:drm_mode_debug_printmodeline [drm]] Modeline 121:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.196033] [drm:drm_mode_debug_printmodeline [drm]] Modeline 122:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
Jan  8 15:51:38 ermintrude kernel: [81479.196300] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:64:HDMI-A-3]
Jan  8 15:51:38 ermintrude kernel: [81479.196313] [drm:intel_hdmi_detect [i915]] [CONNECTOR:64:HDMI-A-3]
Jan  8 15:51:38 ermintrude kernel: [81479.198434] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.198445] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.200564] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.200574] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpd
Jan  8 15:51:38 ermintrude kernel: [81479.201966] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
Jan  8 15:51:38 ermintrude kernel: [81479.202692] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.202702] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.204605] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.204609] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID:  (err -6)
Jan  8 15:51:38 ermintrude kernel: [81479.204613] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:64:HDMI-A-3] disconnected
Jan  8 15:51:38 ermintrude kernel: [81479.204621] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:66:DP-4]
Jan  8 15:51:38 ermintrude kernel: [81479.204632] [drm:intel_dp_detect [i915]] [CONNECTOR:66:DP-4]
Jan  8 15:51:38 ermintrude kernel: [81479.204642] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:66:DP-4] disconnected
Jan  8 15:51:38 ermintrude kernel: [81479.206478] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:47:DP-1]
Jan  8 15:51:38 ermintrude kernel: [81479.206492] [drm:intel_dp_detect [i915]] [CONNECTOR:47:DP-1]
Jan  8 15:51:38 ermintrude kernel: [81479.214897] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.223286] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.231675] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.241954] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.250350] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.258739] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.267130] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.275523] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.283918] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.292306] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.300694] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.309088] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.317476] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.325864] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.334259] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.342647] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.351035] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.359423] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.367812] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.376199] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.384585] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.392974] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.401363] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.409751] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.418138] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.426533] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.442223] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.459805] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.468218] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.476614] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.485003] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.493397] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
Jan  8 15:51:38 ermintrude kernel: [81479.493404] [drm:drm_dp_dpcd_access [drm_kms_helper]] Too many retries, giving up. First error: -110
Jan  8 15:51:38 ermintrude kernel: [81479.493415] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:47:DP-1] disconnected
Jan  8 15:51:38 ermintrude kernel: [81479.493435] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:51:HDMI-A-1]
Jan  8 15:51:38 ermintrude kernel: [81479.493447] [drm:intel_hdmi_detect [i915]] [CONNECTOR:51:HDMI-A-1]
Jan  8 15:51:38 ermintrude kernel: [81479.495566] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.495582] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.497029] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.497039] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpb
Jan  8 15:51:38 ermintrude kernel: [81479.499156] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.499166] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.500666] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.500670] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID:  (err -6)
Jan  8 15:51:38 ermintrude kernel: [81479.500673] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:51:HDMI-A-1] disconnected
Jan  8 15:51:38 ermintrude kernel: [81479.500690] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:54:DP-2]
Jan  8 15:51:38 ermintrude kernel: [81479.500705] [drm:intel_dp_detect [i915]] [CONNECTOR:54:DP-2]
Jan  8 15:51:38 ermintrude kernel: [81479.501097] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 00 01 00 02 02 06 00 00 00 00
Jan  8 15:51:38 ermintrude kernel: [81479.501365] [drm:intel_dp_detect [i915]] Display Port TPS3 support: source yes, sink yes
Jan  8 15:51:38 ermintrude kernel: [81479.501376] [drm:intel_dp_print_rates [i915]] source rates: 162000, 216000, 270000, 324000, 432000, 540000
Jan  8 15:51:38 ermintrude kernel: [81479.501386] [drm:intel_dp_print_rates [i915]] sink rates: 162000, 270000, 540000
Jan  8 15:51:38 ermintrude kernel: [81479.501396] [drm:intel_dp_print_rates [i915]] common rates: 162000, 270000, 540000
Jan  8 15:51:38 ermintrude kernel: [81479.501753] [drm:intel_dp_read_desc [i915]] DP sink: OUI 00-00-00(NS) dev-ID  HW-rev 0.0 SW-rev 0.0
Jan  8 15:51:38 ermintrude kernel: [81479.502020] [drm:intel_dp_detect [i915]] Sink is not MST capable
Jan  8 15:51:38 ermintrude kernel: [81479.502402] [drm:drm_add_edid_modes [drm]] HDMI: DVI dual 1, max TMDS clock 600000 kHz
Jan  8 15:51:38 ermintrude kernel: [81479.502409] [drm:drm_edid_to_eld [drm]] ELD monitor U2879G6
Jan  8 15:51:38 ermintrude kernel: [81479.502415] [drm:drm_edid_to_eld [drm]] HDMI: latency present 0 0, video latency 0 1, audio latency 96 2
Jan  8 15:51:38 ermintrude kernel: [81479.502426] [drm:intel_connector_update_modes [i915]] ELD size 32, SAD count 1
Jan  8 15:51:38 ermintrude kernel: [81479.502461] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:54:DP-2] probed modes :
Jan  8 15:51:38 ermintrude kernel: [81479.502469] [drm:drm_mode_debug_printmodeline [drm]] Modeline 69:"3840x2160" 60 533250 3840 3888 3920 4000 2160 2163 2168 2222 0x48 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.502475] [drm:drm_mode_debug_printmodeline [drm]] Modeline 132:"3840x2160" 30 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502480] [drm:drm_mode_debug_printmodeline [drm]] Modeline 163:"3840x2160" 30 296703 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502485] [drm:drm_mode_debug_printmodeline [drm]] Modeline 70:"3840x2160" 30 262750 3840 3888 3920 4000 2160 2163 2168 2191 0x40 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.502491] [drm:drm_mode_debug_printmodeline [drm]] Modeline 133:"3840x2160" 25 297000 3840 4896 4984 5280 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502495] [drm:drm_mode_debug_printmodeline [drm]] Modeline 139:"3840x2160" 24 297000 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502500] [drm:drm_mode_debug_printmodeline [drm]] Modeline 164:"3840x2160" 24 296703 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502505] [drm:drm_mode_debug_printmodeline [drm]] Modeline 71:"1920x2160" 60 277250 1920 1968 2000 2080 2160 2163 2173 2222 0x40 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.502510] [drm:drm_mode_debug_printmodeline [drm]] Modeline 75:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502515] [drm:drm_mode_debug_printmodeline [drm]] Modeline 94:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502519] [drm:drm_mode_debug_printmodeline [drm]] Modeline 151:"1920x1080" 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502524] [drm:drm_mode_debug_printmodeline [drm]] Modeline 117:"1920x1080i" 60 74250 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.502529] [drm:drm_mode_debug_printmodeline [drm]] Modeline 162:"1920x1080i" 60 74176 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.502534] [drm:drm_mode_debug_printmodeline [drm]] Modeline 95:"1920x1080" 50 148500 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502538] [drm:drm_mode_debug_printmodeline [drm]] Modeline 118:"1920x1080i" 50 74250 1920 2448 2492 2640 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.502543] [drm:drm_mode_debug_printmodeline [drm]] Modeline 79:"1680x1050" 60 146250 1680 1784 1960 2240 1050 1053 1059 1089 0x40 0x6
Jan  8 15:51:38 ermintrude kernel: [81479.502550] [drm:drm_mode_debug_printmodeline [drm]] Modeline 87:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502555] [drm:drm_mode_debug_printmodeline [drm]] Modeline 76:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502560] [drm:drm_mode_debug_printmodeline [drm]] Modeline 78:"1440x900" 60 106500 1440 1520 1672 1904 900 903 909 934 0x40 0x6
Jan  8 15:51:38 ermintrude kernel: [81479.502564] [drm:drm_mode_debug_printmodeline [drm]] Modeline 77:"1280x960" 60 108000 1280 1376 1488 1800 960 961 964 1000 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502569] [drm:drm_mode_debug_printmodeline [drm]] Modeline 72:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502574] [drm:drm_mode_debug_printmodeline [drm]] Modeline 140:"1280x720" 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502578] [drm:drm_mode_debug_printmodeline [drm]] Modeline 97:"1280x720" 50 74250 1280 1720 1760 1980 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502583] [drm:drm_mode_debug_printmodeline [drm]] Modeline 88:"1024x768" 75 78750 1024 1040 1136 1312 768 769 772 800 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502588] [drm:drm_mode_debug_printmodeline [drm]] Modeline 89:"1024x768" 70 75000 1024 1048 1184 1328 768 771 777 806 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502592] [drm:drm_mode_debug_printmodeline [drm]] Modeline 90:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502597] [drm:drm_mode_debug_printmodeline [drm]] Modeline 91:"832x624" 75 57284 832 864 928 1152 624 625 628 667 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502601] [drm:drm_mode_debug_printmodeline [drm]] Modeline 92:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502606] [drm:drm_mode_debug_printmodeline [drm]] Modeline 93:"800x600" 72 50000 800 856 976 1040 600 637 643 666 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502610] [drm:drm_mode_debug_printmodeline [drm]] Modeline 80:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502615] [drm:drm_mode_debug_printmodeline [drm]] Modeline 81:"800x600" 56 36000 800 824 896 1024 600 601 603 625 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.502619] [drm:drm_mode_debug_printmodeline [drm]] Modeline 73:"720x576" 50 27000 720 732 796 864 576 581 586 625 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502624] [drm:drm_mode_debug_printmodeline [drm]] Modeline 141:"720x480" 60 27027 720 736 798 858 480 489 495 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502628] [drm:drm_mode_debug_printmodeline [drm]] Modeline 74:"720x480" 60 27000 720 736 798 858 480 489 495 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502633] [drm:drm_mode_debug_printmodeline [drm]] Modeline 82:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502637] [drm:drm_mode_debug_printmodeline [drm]] Modeline 83:"640x480" 73 31500 640 664 704 832 480 489 492 520 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502641] [drm:drm_mode_debug_printmodeline [drm]] Modeline 84:"640x480" 67 30240 640 704 768 864 480 483 486 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502646] [drm:drm_mode_debug_printmodeline [drm]] Modeline 147:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502650] [drm:drm_mode_debug_printmodeline [drm]] Modeline 85:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.502655] [drm:drm_mode_debug_printmodeline [drm]] Modeline 86:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
Jan  8 15:51:38 ermintrude kernel: [81479.502761] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:58:HDMI-A-2]
Jan  8 15:51:38 ermintrude kernel: [81479.502772] [drm:intel_hdmi_detect [i915]] [CONNECTOR:58:HDMI-A-2]
Jan  8 15:51:38 ermintrude kernel: [81479.505522] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.505535] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.507658] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.507666] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpc
Jan  8 15:51:38 ermintrude kernel: [81479.509784] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.509794] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.511910] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.511914] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID:  (err -6)
Jan  8 15:51:38 ermintrude kernel: [81479.511917] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:58:HDMI-A-2] disconnected
Jan  8 15:51:38 ermintrude kernel: [81479.511932] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:60:DP-3]
Jan  8 15:51:38 ermintrude kernel: [81479.511947] [drm:intel_dp_detect [i915]] [CONNECTOR:60:DP-3]
Jan  8 15:51:38 ermintrude kernel: [81479.512344] [drm:intel_dp_read_dpcd [i915]] DPCD: 11 0a a4 01 01 00 01 81 00 00 00 00 00 00 00
Jan  8 15:51:38 ermintrude kernel: [81479.512667] [drm:intel_dp_detect [i915]] Display Port TPS3 support: source yes, sink no
Jan  8 15:51:38 ermintrude kernel: [81479.512678] [drm:intel_dp_print_rates [i915]] source rates: 162000, 216000, 270000, 324000, 432000, 540000
Jan  8 15:51:38 ermintrude kernel: [81479.512688] [drm:intel_dp_print_rates [i915]] sink rates: 162000, 270000
Jan  8 15:51:38 ermintrude kernel: [81479.512698] [drm:intel_dp_print_rates [i915]] common rates: 162000, 270000
Jan  8 15:51:38 ermintrude kernel: [81479.513065] [drm:intel_dp_read_desc [i915]] DP sink: OUI 00-80-e1 dev-ID Dp1.2 HW-rev 0.0 SW-rev 0.0
Jan  8 15:51:38 ermintrude kernel: [81479.513074] [drm:intel_dp_detect [i915]] Sink is not MST capable
Jan  8 15:51:38 ermintrude kernel: [81479.513395] [drm:do_detailed_mode [drm]] composite sync not supported
Jan  8 15:51:38 ermintrude kernel: [81479.513461] [drm:drm_add_edid_modes [drm]] HDMI: DVI dual 0, max TMDS clock 300000 kHz
Jan  8 15:51:38 ermintrude kernel: [81479.513467] [drm:drm_edid_to_eld [drm]] ELD monitor DELL P2815Q
Jan  8 15:51:38 ermintrude kernel: [81479.513473] [drm:drm_edid_to_eld [drm]] HDMI: latency present 0 0, video latency 0 3, audio latency 96 2
Jan  8 15:51:38 ermintrude kernel: [81479.513484] [drm:intel_connector_update_modes [i915]] ELD size 36, SAD count 1
Jan  8 15:51:38 ermintrude kernel: [81479.513522] [drm:drm_mode_debug_printmodeline [drm]] Modeline 177:"720x480i" 0 13500 720 739 801 858 480 488 494 525 0x40 0x101a
Jan  8 15:51:38 ermintrude kernel: [81479.513529] [drm:drm_mode_prune_invalid [drm]] Not using 720x480i mode: H_ILLEGAL
Jan  8 15:51:38 ermintrude kernel: [81479.513535] [drm:drm_mode_debug_printmodeline [drm]] Modeline 178:"720x576i" 0 13500 720 732 795 864 576 580 586 625 0x40 0x101a
Jan  8 15:51:38 ermintrude kernel: [81479.513541] [drm:drm_mode_prune_invalid [drm]] Not using 720x576i mode: H_ILLEGAL
Jan  8 15:51:38 ermintrude kernel: [81479.513554] [drm:drm_mode_debug_printmodeline [drm]] Modeline 200:"720x480i" 60 13514 720 739 801 858 480 488 494 525 0x40 0x101a
Jan  8 15:51:38 ermintrude kernel: [81479.513558] [drm:drm_mode_prune_invalid [drm]] Not using 720x480i mode: H_ILLEGAL
Jan  8 15:51:38 ermintrude kernel: [81479.513566] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:60:DP-3] probed modes :
Jan  8 15:51:38 ermintrude kernel: [81479.513571] [drm:drm_mode_debug_printmodeline [drm]] Modeline 98:"3840x2160" 30 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x48 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513576] [drm:drm_mode_debug_printmodeline [drm]] Modeline 148:"3840x2160" 30 296703 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513581] [drm:drm_mode_debug_printmodeline [drm]] Modeline 146:"3840x2160" 25 297000 3840 4896 4984 5280 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513586] [drm:drm_mode_debug_printmodeline [drm]] Modeline 145:"3840x2160" 24 297000 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513590] [drm:drm_mode_debug_printmodeline [drm]] Modeline 161:"3840x2160" 24 296703 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513595] [drm:drm_mode_debug_printmodeline [drm]] Modeline 100:"2560x1440" 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.513600] [drm:drm_mode_debug_printmodeline [drm]] Modeline 115:"1920x1200" 60 154000 1920 1968 2000 2080 1200 1203 1209 1235 0x40 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.513604] [drm:drm_mode_debug_printmodeline [drm]] Modeline 99:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513609] [drm:drm_mode_debug_printmodeline [drm]] Modeline 149:"1920x1080" 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513614] [drm:drm_mode_debug_printmodeline [drm]] Modeline 137:"1920x1080i" 60 74250 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.513618] [drm:drm_mode_debug_printmodeline [drm]] Modeline 157:"1920x1080i" 60 74176 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.513623] [drm:drm_mode_debug_printmodeline [drm]] Modeline 128:"1920x1080" 50 148500 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513627] [drm:drm_mode_debug_printmodeline [drm]] Modeline 136:"1920x1080i" 50 74250 1920 2448 2492 2640 1080 1084 1094 1125 0x40 0x15
Jan  8 15:51:38 ermintrude kernel: [81479.513632] [drm:drm_mode_debug_printmodeline [drm]] Modeline 144:"1920x1080" 30 74250 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513637] [drm:drm_mode_debug_printmodeline [drm]] Modeline 160:"1920x1080" 30 74176 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513641] [drm:drm_mode_debug_printmodeline [drm]] Modeline 143:"1920x1080" 25 74250 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513646] [drm:drm_mode_debug_printmodeline [drm]] Modeline 142:"1920x1080" 24 74250 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513650] [drm:drm_mode_debug_printmodeline [drm]] Modeline 159:"1920x1080" 24 74176 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513655] [drm:drm_mode_debug_printmodeline [drm]] Modeline 113:"1600x1200" 60 162000 1600 1664 1856 2160 1200 1201 1204 1250 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513660] [drm:drm_mode_debug_printmodeline [drm]] Modeline 114:"1680x1050" 60 119000 1680 1728 1760 1840 1050 1053 1059 1080 0x40 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.513664] [drm:drm_mode_debug_printmodeline [drm]] Modeline 123:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513669] [drm:drm_mode_debug_printmodeline [drm]] Modeline 112:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513674] [drm:drm_mode_debug_printmodeline [drm]] Modeline 102:"1280x800" 60 71000 1280 1328 1360 1440 800 803 809 823 0x40 0x9
Jan  8 15:51:38 ermintrude kernel: [81479.513678] [drm:drm_mode_debug_printmodeline [drm]] Modeline 101:"1152x864" 75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513683] [drm:drm_mode_debug_printmodeline [drm]] Modeline 134:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513687] [drm:drm_mode_debug_printmodeline [drm]] Modeline 156:"1280x720" 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513692] [drm:drm_mode_debug_printmodeline [drm]] Modeline 135:"1280x720" 50 74250 1280 1720 1760 1980 720 725 730 750 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513696] [drm:drm_mode_debug_printmodeline [drm]] Modeline 124:"1024x768" 75 78750 1024 1040 1136 1312 768 769 772 800 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513701] [drm:drm_mode_debug_printmodeline [drm]] Modeline 125:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.513705] [drm:drm_mode_debug_printmodeline [drm]] Modeline 126:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513710] [drm:drm_mode_debug_printmodeline [drm]] Modeline 119:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
Jan  8 15:51:38 ermintrude kernel: [81479.513714] [drm:drm_mode_debug_printmodeline [drm]] Modeline 138:"720x576" 50 27000 720 732 796 864 576 581 586 625 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.513719] [drm:drm_mode_debug_printmodeline [drm]] Modeline 153:"720x480" 60 27027 720 736 798 858 480 489 495 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.513723] [drm:drm_mode_debug_printmodeline [drm]] Modeline 130:"720x480" 60 27000 720 736 798 858 480 489 495 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.513728] [drm:drm_mode_debug_printmodeline [drm]] Modeline 120:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.513733] [drm:drm_mode_debug_printmodeline [drm]] Modeline 150:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.513737] [drm:drm_mode_debug_printmodeline [drm]] Modeline 121:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa
Jan  8 15:51:38 ermintrude kernel: [81479.513741] [drm:drm_mode_debug_printmodeline [drm]] Modeline 122:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
Jan  8 15:51:38 ermintrude kernel: [81479.513993] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:64:HDMI-A-3]
Jan  8 15:51:38 ermintrude kernel: [81479.514004] [drm:intel_hdmi_detect [i915]] [CONNECTOR:64:HDMI-A-3]
Jan  8 15:51:38 ermintrude kernel: [81479.515594] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.515605] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.517723] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0050 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.517730] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpd
Jan  8 15:51:38 ermintrude kernel: [81479.519847] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.519858] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK on first message, retry
Jan  8 15:51:38 ermintrude kernel: [81479.521975] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0040 w(1)
Jan  8 15:51:38 ermintrude kernel: [81479.521980] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID:  (err -6)
Jan  8 15:51:38 ermintrude kernel: [81479.521983] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:64:HDMI-A-3] disconnected
Jan  8 15:51:38 ermintrude kernel: [81479.521993] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:66:DP-4]
Jan  8 15:51:38 ermintrude kernel: [81479.522004] [drm:intel_dp_detect [i915]] [CONNECTOR:66:DP-4]
Jan  8 15:51:38 ermintrude kernel: [81479.522014] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:66:DP-4] disconnected
Jan  8 15:57:58 ermintrude kernel: [81859.506021] [drm:drm_internal_framebuffer_create [drm]] could not create framebuffer
Jan  8 15:57:58 ermintrude kernel: [81859.506029] [drm:drm_mode_cursor_universal [drm]] failed to wrap cursor buffer in drm framebuffer

  The section below corresponds with the first time that both displays go black and then reappear:

Jan  8 16:05:11 ermintrude kernel: [82292.056662] [drm:intel_get_hpd_pins [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
Jan  8 16:05:11 ermintrude kernel: [82292.056675] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
Jan  8 16:05:11 ermintrude kernel: [82292.056693] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
Jan  8 16:05:11 ermintrude kernel: [82292.057091] [drm:intel_dp_read_dpcd [i915]] DPCD: 11 0a a4 01 01 00 01 81 00 00 00 00 00 00 00
Jan  8 16:05:11 ermintrude kernel: [82292.057956] [drm:intel_dp_check_link_status [i915]] DDI D: channel EQ not ok, retraining
Jan  8 16:05:11 ermintrude kernel: [82292.058857] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 00000000
Jan  8 16:05:11 ermintrude kernel: [82292.058866] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 0
Jan  8 16:05:11 ermintrude kernel: [82292.058876] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
Jan  8 16:05:11 ermintrude kernel: [82292.058886] [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS1
Jan  8 16:05:11 ermintrude kernel: [82292.060469] [drm:intel_dp_start_link_train [i915]] clock recovery OK
Jan  8 16:05:11 ermintrude kernel: [82292.060478] [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS2
Jan  8 16:05:11 ermintrude kernel: [82292.062421] [drm:intel_dp_start_link_train [i915]] Channel EQ done. DP Training successful
Jan  8 16:05:11 ermintrude kernel: [82292.112788] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

I have a third 4k monitor (also 30Hz, but a Viewsonic, not a Dell) available for testing.  It is possible I suppose that the Dell is faulty.  I'll try using it as the sole monitor tomorrow, and I'll also try substituting the Viewsonic for the Dell.

Just running with the other monitor for the time being (Dell switched off, AOC U2879VF switched on).

The AOC just went blank three times, for about 2 seconds at a time, with about 2 seconds between each blank.

This occurred about 1.5 minutes after the following kernel messages.  Nothing happened which should have caused a hotplug event AFAIK, and I didn't notice any display disturbance at 09:27:35.

Jan  9 09:27:35 ermintrude kernel: [144836.324366] [drm:intel_get_hpd_pins [i915]] hotplug event received, stat 0x00400000, dig 0x10101110, pins 0x00000040
Jan  9 09:27:35 ermintrude kernel: [144836.324380] [drm:intel_hpd_irq_handler [i915]] digital hpd port C - short
Jan  9 09:27:35 ermintrude kernel: [144836.324398] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port C - short
Jan  9 09:27:35 ermintrude kernel: [144836.324796] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 00 01 00 02 02 06 00 00 00 00
Jan  9 09:27:35 ermintrude kernel: [144836.325619] [drm:intel_dp_check_link_status [i915]] DDI C: channel EQ not ok, retraining
Jan  9 09:27:35 ermintrude kernel: [144836.326502] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 00000000
Jan  9 09:27:35 ermintrude kernel: [144836.326512] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 0
Jan  9 09:27:35 ermintrude kernel: [144836.326521] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
Jan  9 09:27:35 ermintrude kernel: [144836.326531] [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS1
Jan  9 09:27:35 ermintrude kernel: [144836.327099] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 04000000
Jan  9 09:27:35 ermintrude kernel: [144836.327109] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 1
Jan  9 09:27:35 ermintrude kernel: [144836.327118] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
Jan  9 09:27:35 ermintrude kernel: [144836.327678] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 07000000
Jan  9 09:27:35 ermintrude kernel: [144836.327687] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
Jan  9 09:27:35 ermintrude kernel: [144836.327696] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
Jan  9 09:27:35 ermintrude kernel: [144836.328257] [drm:intel_dp_start_link_train [i915]] clock recovery OK
Jan  9 09:27:35 ermintrude kernel: [144836.328266] [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS3
Jan  9 09:27:35 ermintrude kernel: [144836.329133] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 08000000
Jan  9 09:27:35 ermintrude kernel: [144836.329142] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
Jan  9 09:27:35 ermintrude kernel: [144836.329151] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
Jan  9 09:27:35 ermintrude kernel: [144836.330007] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 08000000
Jan  9 09:27:35 ermintrude kernel: [144836.330016] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
Jan  9 09:27:35 ermintrude kernel: [144836.330025] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
Jan  9 09:27:35 ermintrude kernel: [144836.330882] [drm:intel_dp_start_link_train [i915]] Channel EQ done. DP Training successful
Jan  9 09:27:35 ermintrude kernel: [144836.355682] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Created attachment 128826 [details]
DRM kernel messages with dual 4k monitors (AOC + ViewSonic)

Same flashing behaviour now with the Dell disconnected, and the AOC and ViewSonic monitors connected (also rebooted).

I haven't tried a single monitor config from cold-boot yet, but can do if you think it's worth trying.

kernel messages in previously created attachment.

Another twist with the viewsonic - sometimes it doesn't come back from going blank, but goes into powersave mode instead.   The left-hand AOC is working fine at this point.  Running xrandr then shows the ViewSonic display as:

DP-3-8 disconnected 3840x2160+3840+0 (normal left inverted right x axis y axis) 0mm x 0mm

... but about half the time, the act of running xrandr itself, then makes the  ViewSonic wake up again - the AOC flickers briefly, and the ViewSonic powers back up.  I'll add another attachment with the kernel messages when this happens, and the xrandr output.

Created attachment 128829 [details]
xrandr causing second monitor to wake up (previously showing as disconnected, and monitor reporting power save mode).

Thank you Tim for detailed information. If you have time and energy, please have a trial with the latest drm-tip, and attach the latest dmesgs like you did earlier. Additionally please attach cat /sys/kernel/debug/dri/0/i915_display_info from before (second display disconnected state) and after xrandr.

I'll try also to reproduce this, keep posted.

I built and I'm currently running 4.11.0-rc8-drm-tip+ #8 SMP Mon Apr 24 10:06:22 UTC 2017 x86_64 GNU/Linux

... in response to your last comment.  Apologies for the delay - I haven't been using this system as much recently.  The problem seems better with this build, but not eliminated.  I now usually only lose one display at a time, and not nearly so frequently.  The system will typically be OK for >24 hours, but once it starts the symptom, it then reoccurs about once per hour.

The original kernel debug messages are gone, but I'm seeing:

[344312.224123] [drm:asle_work [i915]] bclp = 0x8000000c
[344312.224138] [drm:asle_work [i915]] updating opregion backlight 12/255
[344341.776561] [drm:asle_work [i915]] bclp = 0x80000019
[344341.776577] [drm:asle_work [i915]] updating opregion backlight 25/255

which I *think* are associated with the screen flashes.  The system is a desktop with two 4k monitors.

(In reply to Tim Small from comment #9)
> The original kernel debug messages are gone, but I'm seeing:
> 
> [344312.224123] [drm:asle_work [i915]] bclp = 0x8000000c
> [344312.224138] [drm:asle_work [i915]] updating opregion backlight 12/255
> [344341.776561] [drm:asle_work [i915]] bclp = 0x80000019
> [344341.776577] [drm:asle_work [i915]] updating opregion backlight 25/255
> 
> which I *think* are associated with the screen flashes.  The system is a
> desktop with two 4k monitors.

These messages are not relevant here.

(In reply to Jani Nikula from comment #10)
 
> These messages are not relevant here.

ACK.  Another occurrence this morning didn't coincide with these messages.  Also no messages in Xorg log.

The kernel is currently booted with drm.debug=0xe log_buf_len=1M and was built from drm-tip on 24th April (4.11.0-rc8).  The issue definitely seems less frequent and severe than previously, but is still occurring fairly regularly.

Some other variables which might be at play here.  I sometimes use:

xset dpms force standby

and I also sometimes change the monitor brightness levels using ddccontrol

Probably unrelated, but I thought I should mention it...

Created attachment 132154 [details]
kernel messages preceding monitor blanking  on 4.12.0-rc6-drm-tip-22-Jun-2017.txt

I updated to drm-tip from yesterday (4.12.0-rc6) to get the CVE-2017-1000364 fix.  This version appears quite a bit worse than 4.11.0-rc8 drm-tip code (April 24th), to the point of being unusable for work - screen blanks frequently and within a few minutes of logging in (in limited testing).

Hi Tim,
I have been trying to reproduce the test as you did, but with this configuration. 
Using a NUC-SKL Canyon with two monitors --one with 30Hz connected with HDMI (ASUS), and other one 60Hz connected with DP (ACER).

I did the installation of the latest kernel and I have been using my system for many hours but I was not be able to reproduce that behavior

Adding my general configuration and logs.

Could you be able to try with this configuration and share your comments?


======================================
             Software
======================================
kernel version              : 4.13.0-rc3-drm-tip-ww31-commit-87ad063+
architecture                : x86_64
os version                  : Ubuntu 17.04
os codename                 : zesty
kernel driver               : i915
bios revision               : 5.6
bios release date           : 09/29/2016

======================================
        Graphic drivers
======================================
mesa                      : 17.0.3
modesetting               : modesetting_drv.so
xorg-xserver              : 1.19.3
libdrm                    : 2.4.76
libva                     : 1.7.3-2
vaapi (intel-driver)      : 1.7.3
cairo                     : 1.14.8-1
intel-gpu-tools           : 1.17-1

======================================
             Hardware
======================================
platform                   : SKL Canyon
motherboard id             : NUC6i7KYB
form factor                : Desktop
cpu family                 : Core i7
cpu family id              : 6
cpu information            : Intel(R) Core(TM) i7-6770HQ CPU @ 2.60GHz
gpu card                   : Intel Corporation Iris Pro Graphics 580 (rev 09) (prog-if 00 [VGA controller])
memory ram                 : 31.31 GB
max memory ram             : 32 GB
display resolution         : 1600x900
cpu thread                 : 8
cpu core                   : 4
cpu model                  : 94
cpu stepping               : 3
socket                     : Other
signature                  : Type 0, Family 6, Model 94, Stepping 3
hard drive                 : 223GiB (240GB)
current cd clock frequency : 540000 kHz
maximum cd clock frequency : 675000 kHz
displays connected         : DP-1 DP-3

======================================
             kernel parameters
======================================
quiet splash fastboot drm.debug=0xe

Created attachment 133159 [details]
kern.log

Couldn't find commit 87ad063, as I assume the drm-tip rewrite history merge has made it go away, but I'm building 4.13.0-rc3 drm-tip now:

commit f9cb5a18db70d51c9f5b3db8253d6c42255cab35
Author: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date:   Tue Aug 1 11:47:16 2017 +0200

    drm-tip: 2017y-08m-01d-09h-46m-24s UTC integration manifest

Being paranoid, perhaps it's a good idea to use your .config to check we're starting from the same place too please?

What util did you use to get the config dump?

Both monitors are connected via DP FWIW.  I could probably try via HDMI if you think it worthwhile?

$ xrandr
Screen 0: minimum 320 x 200, current 7680 x 2160, maximum 8192 x 8192
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 621mm x 341mm
   3840x2160     60.00 +  30.00*   25.00    24.00    29.97    23.98  
   1920x2160     59.99  
   2560x1440     59.95  
   1920x1080     60.00    60.00    50.00    50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1680x1050     59.95  
   1280x1024     60.02  
   1440x900      59.89  
   1280x960      60.00  
   1280x720      60.00    50.00    59.94  
   1024x768      60.00  
   800x600       60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-2 connected 3840x2160+3840+0 (normal left inverted right x axis y axis) 621mm x 341mm
   3840x2160     30.00*+  25.00    24.00    29.97    23.98  
   2560x1440     59.95  
   1920x1200     59.95  
   1920x1080     60.00    50.00    59.94    30.00    25.00    24.00    29.97    23.98  
   1920x1080i    60.00    50.00    59.94  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
HDMI-3 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)


Not sure when DP-1 went to 30Hz, I'll change it to 60Hz and see if that makes the problem better.

(In reply to Tim Small from comment #16)
> Couldn't find commit 87ad063, as I assume the drm-tip rewrite history merge
> has made it go away, but I'm building 4.13.0-rc3 drm-tip now:
Hi, any news with latest commits?

> Being paranoid, perhaps it's a good idea to use your .config to check we're
> starting from the same place too please?
Config should be the default one with CONFIG_DEBUG_INFO disable in order to build the kernel faster.

> What util did you use to get the config dump?
> 
> Both monitors are connected via DP FWIW.  I could probably try via HDMI if
> you think it worthwhile? ...
Are you using a dongle or docking station? Did you have the chance to test via HDMI?

> ...
> Not sure when DP-1 went to 30Hz, I'll change it to 60Hz and see if that
> makes the problem better.
Do this changed anything?

This doesn't look as a regression at all. No good or bad commit identified, so removing Regression tag.

It seems better running 4.13.0-rc3-drm-tip+ #10 SMP Tue Aug 1, but I've still seen occasional incidents.

The machine is a desktop, so no dongle etc. just two DP<->DP cables.  I have not yet tried HDMI for a single monitor, but can do so if you think that would be useful.

I can also try to build a newer kernel if you like?

If you have time to dedicate to this, it would be good to know if latest mainline resolve the issue. https://www.kernel.org

OK, no problem I'll build a new kernel.  Would you like me to use drm-tip or 4.13, or wait for 4.14 ?

drm-tip includes all the latest changes made day by day, so tip or 4.14 will be okay.

Created attachment 136171 [details]
monitor flashing state kernel log Bug occurred again.  Same symptoms as before.  Linux ermintrude 4.14.0-rc8-drm-tip+

Bug occurred again.  Same symptoms as before.

Linux ermintrude 4.14.0-rc8-drm-tip+ #11 SMP Wed Nov 8 11:09:20 UTC 2017 x86_64 GNU/Linux

An initial bunch of hot plug events, followed by flashing on the secondary display (with no further log messages).  Got a video this time, will put it up shortly.

Have updated to 4.15.0-rc7-drm-tip+ #12 SMP Tue Jan 9 12:46:56 UTC 2018 and the problem is now back to being very frequent and is following the behaviour in the first comment again.

Following boot, everything will be fine for a while, then both monitors blank briefly - in the logs I get:

[16233.854617] [drm:gen8_irq_handler [i915]] hotplug event received, stat 0x00400000, dig 0x10101110, pins 0x00000040
[16233.854746] [drm:intel_hpd_irq_handler [i915]] digital hpd port C - short
[16233.855222] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port C - short
[16233.857027] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 00 01 40 02 02 06 00 00 00 00
[16233.857941] [drm:intel_dp_check_link_status [i915]] DDI C: channel EQ not ok, retraining
[16233.859760] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 00000000
[16233.859874] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 0
[16233.859969] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
[16233.860096] [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS1
[16233.860995] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 04000000
[16233.861042] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 1
[16233.861063] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
[16233.861689] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 07000000
[16233.861715] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
[16233.861737] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
[16233.862349] [drm:intel_dp_start_link_train [i915]] clock recovery OK
[16233.862378] [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS3
[16233.863848] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 08000000
[16233.863871] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
[16233.863908] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
[16233.864840] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 08000000
[16233.864864] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
[16233.864886] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
[16233.865773] [drm:intel_dp_start_link_train [i915]] Channel EQ done. DP Training successful
[16233.865964] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:65:DP-1] Link Training Passed at Link Rate = 540000, Lane count = 4
[16233.887606] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Once that has happened once, then the right-hand screen becomes prone to blanking for a few seconds at a time, repeatedly, following irregular timings, but often coming in clusters.  There are no further kernel errors when the blanks occur.

Sometimes it seems possible to trigger the blanking by repeatedly moving the mouse cursor onto the secondary screen from the primary screen, but sometimes it occurs without this, and it's possible that the two are connected.

https://photos.app.goo.gl/kxfFkcGejisng8Op1

First of all. Sorry about spam.
This is mass update for our bugs. 

Sorry if you feel this annoying but with this trying to understand if bug still valid or not.
If bug investigation still in progress, please ignore this and I apologize!

If you think this is not anymore valid, please comment to the bug that can be closed.
If you haven't tested with our latest pre-upstream tree(drm-tip), can you do that also to see if issue is valid there still and if you cannot see issue there, please comment to the bug.

Closing, please re-open if still occurs.

Still present in 4.16.0-rc7-drm-tip+ #21 SMP Thu Apr 12

With 4.17 (now running 4.17.0-rc4-drm-tip+), this now seems to happen much sooner after boot (usually within 5 minutes), and more frequently.

Test system is Dell Optiplex 5040 with two 4k monitors both attached to DisplayPort.

It looks like there are a few spurious hot plug events (at least I presume they are spurious - no hardware is actually physically hot plugged e.g. hot plug events are seen on the HDMI port - which never has anything plugged into it), and the flashing/black behaviour seems to start after these.

The flashing/black display seems like it might occur after only after the spurious hot plug events come in, so I suppose it might be possible to reproduce them by a few real hotplugs?


--
May 11 11:00:46 ermintrude kernel: [   10.224260] [drm:i915_audio_component_get_eld [i915]] Not valid for port D
May 11 11:00:46 ermintrude kernel: [   10.224278] [drm:i915_audio_component_get_eld [i915]] Not valid for port D
May 11 11:00:46 ermintrude kernel: [   10.224296] [drm:i915_audio_component_get_eld [i915]] Not valid for port D
May 11 11:00:46 ermintrude kernel: [   18.225601] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10121010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.225650] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - long
May 11 11:00:46 ermintrude kernel: [   18.225697] [drm:intel_hpd_irq_handler [i915]] Received HPD interrupt on PIN 7 - cnt: 0
May 11 11:00:46 ermintrude kernel: [   18.225754] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - long
May 11 11:00:46 ermintrude kernel: [   18.225803] [drm:i915_hotplug_work_func [i915]] running encoder hotplug functions
May 11 11:00:46 ermintrude kernel: [   18.225849] [drm:i915_hotplug_work_func [i915]] Connector DP-2 (pin 7) received hotplug event.
May 11 11:00:46 ermintrude kernel: [   18.225894] [drm:intel_dp_detect [i915]] [CONNECTOR:85:DP-2]
May 11 11:00:46 ermintrude kernel: [   18.226347] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 e4 01 01 01 01 81 00 00 00 00 00 00 00
May 11 11:00:46 ermintrude kernel: [   18.227353] [drm:intel_dp_print_rates [i915]] source rates: 162000, 216000, 270000, 324000, 432000, 540000
--
May 11 11:00:46 ermintrude kernel: [   18.227436] [drm:intel_dp_print_rates [i915]] common rates: 162000, 270000, 540000
May 11 11:00:46 ermintrude kernel: [   18.227826] [drm:drm_dp_read_desc [drm_kms_helper]] DP branch: OUI 00-80-e1 dev-ID Dp1.2 HW-rev 0.0 SW-rev 0.21 quirks 0x0000
May 11 11:00:46 ermintrude kernel: [   18.228147] [drm:intel_dp_detect [i915]] Sink is MST capable
May 11 11:00:46 ermintrude kernel: [   18.229299] [drm:i915_hotplug_work_func [i915]] Connector HDMI-A-3 (pin 7) received hotplug event.
May 11 11:00:46 ermintrude kernel: [   18.229341] [drm:intel_hdmi_detect [i915]] [CONNECTOR:90:HDMI-A-3]
May 11 11:00:46 ermintrude kernel: [   18.229673] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0050 w(1)
May 11 11:00:46 ermintrude kernel: [   18.229712] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK on first message, retry
--
May 11 11:00:46 ermintrude kernel: [   18.233206] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK on first message, retry
May 11 11:00:46 ermintrude kernel: [   18.233514] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 0040 w(1)
May 11 11:00:46 ermintrude kernel: [   18.233539] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID:  (err -6)
May 11 11:00:46 ermintrude kernel: [   18.239730] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.239779] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.239868] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.240320] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 01
May 11 11:00:46 ermintrude kernel: [   18.241707] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.241752] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.243318] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.243366] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.243416] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.243848] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.245257] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.245305] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.246987] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.247036] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.247089] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.247522] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
--
May 11 11:00:46 ermintrude kernel: [   18.248355] [drm:drm_dp_send_link_address [drm_kms_helper]] port 2: input 0, pdt: 0, pn: 1, dpcd_rev: 00, mcs: 0, ddps: 0, ldps 0, sdp 0/0
May 11 11:00:46 ermintrude kernel: [   18.249178] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.249220] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.252375] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.252424] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.252473] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.252911] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.253367] [drm:drm_dp_send_enum_path_resources.isra.21 [drm_kms_helper]] enum path resources 8: 2560 2560
May 11 11:00:46 ermintrude kernel: [   18.253941] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.253990] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.261817] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.261868] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.261921] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.262356] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.264740] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.264783] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.269967] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.270015] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.270063] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.270492] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.272262] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.272306] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.274867] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.274909] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.274955] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.275381] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.277145] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.277193] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.279791] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.279837] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.279887] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.280318] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.282070] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.282114] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.284772] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.284818] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.284867] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.285313] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.288441] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.288485] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.294263] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.294299] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.294335] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.294754] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.296492] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.296526] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.299153] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.299179] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.299207] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.299629] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.301322] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.301347] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.304076] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.304098] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.304120] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.304515] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
May 11 11:00:46 ermintrude kernel: [   18.306213] [drm:intel_dp_check_mst_status [i915]] got esi2 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.306234] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.309099] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.309118] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.309139] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.309543] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
--
May 11 11:00:46 ermintrude kernel: [   18.333542] [drm:verify_single_dpll_state.isra.114 [i915]] DPLL 3
May 11 11:00:46 ermintrude kernel: [   18.346684] [drm:intel_enable_shared_dpll [i915]] enable DPLL 1 (active 3, on? 1) for crtc 55
May 11 11:00:46 ermintrude kernel: [   18.346708] [drm:intel_mst_pre_enable_dp [i915]] active links 0
May 11 11:00:46 ermintrude kernel: [   18.350177] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.350242] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.350322] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.350788] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
--
May 11 11:00:46 ermintrude kernel: [   18.382100] [drm:intel_mst_enable_dp [i915]] active links 1
May 11 11:00:46 ermintrude kernel: [   18.393637] [drm:drm_dp_check_act_status [drm_kms_helper]] failed to get ACT bit 1 after 30 retries
May 11 11:00:46 ermintrude kernel: [   18.393651] [drm:drm_dp_update_payload_part2 [drm_kms_helper]] payload 0 1
May 11 11:00:46 ermintrude kernel: [   18.397012] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.397078] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.397159] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.397622] [drm:intel_dp_check_mst_status [i915]] got esi 01 00 00
May 11 11:00:46 ermintrude kernel: [   18.399125] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.399187] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.399253] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.399704] [drm:intel_dp_check_mst_status [i915]] got esi 01 10 00
--
May 11 11:00:46 ermintrude kernel: [   18.442480] [drm:drm_setup_crtcs [drm_kms_helper]] picking CRTCs for 3840x2160 config
May 11 11:00:46 ermintrude kernel: [   18.442498] [drm:drm_setup_crtcs [drm_kms_helper]] desired mode 3840x2160 set on crtc 41 (0,0)
May 11 11:00:46 ermintrude kernel: [   18.442510] [drm:drm_setup_crtcs [drm_kms_helper]] desired mode 3840x2160 set on crtc 55 (0,0)
May 11 11:00:46 ermintrude kernel: [   18.567263] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:00:46 ermintrude kernel: [   18.567338] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:00:46 ermintrude kernel: [   18.567465] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:00:46 ermintrude kernel: [   18.567967] [drm:intel_dp_check_mst_status [i915]] channel EQ not ok, retraining
--
May 11 11:01:35 ermintrude kernel: [   67.169659] [drm:drm_mode_debug_printmodeline [drm]] Modeline 146:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
May 11 11:01:35 ermintrude kernel: [   67.169760] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:119:DP-5]
May 11 11:01:35 ermintrude kernel: [   67.169766] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:119:DP-5] disconnected
May 11 11:03:17 ermintrude kernel: [  169.628867] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00800000, dig 0x10111010, pins 0x00000080
May 11 11:03:17 ermintrude kernel: [  169.628891] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short
May 11 11:03:17 ermintrude kernel: [  169.628919] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - short
May 11 11:03:17 ermintrude kernel: [  169.629341] [drm:intel_dp_check_mst_status [i915]] channel EQ not ok, retraining
--
May 11 11:03:17 ermintrude kernel: [  169.663560] [drm:drm_mode_debug_printmodeline [drm]] Modeline 146:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
May 11 11:03:17 ermintrude kernel: [  169.663958] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:119:DP-5]
May 11 11:03:17 ermintrude kernel: [  169.663962] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:119:DP-5] disconnected
May 11 11:03:18 ermintrude kernel: [  170.309991] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00400000, dig 0x10101110, pins 0x00000040
May 11 11:03:18 ermintrude kernel: [  170.310017] [drm:intel_hpd_irq_handler [i915]] digital hpd port C - short
May 11 11:03:18 ermintrude kernel: [  170.310063] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port C - short
May 11 11:03:18 ermintrude kernel: [  170.310499] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 00 01 40 02 02 06 00 00 00 00
May 11 11:03:18 ermintrude kernel: [  170.311489] [drm:i915_hotplug_work_func [i915]] running encoder hotplug functions
May 11 11:03:18 ermintrude kernel: [  170.311515] [drm:i915_hotplug_work_func [i915]] Connector DP-1 (pin 6) received hotplug event.
May 11 11:03:18 ermintrude kernel: [  170.311540] [drm:intel_dp_detect [i915]] [CONNECTOR:77:DP-1]
May 11 11:03:18 ermintrude kernel: [  170.311966] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 00 01 40 02 02 06 00 00 00 00
May 11 11:03:18 ermintrude kernel: [  170.312265] [drm:intel_dp_print_rates [i915]] source rates: 162000, 216000, 270000, 324000, 432000, 540000
--
May 11 11:03:18 ermintrude kernel: [  170.325597] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
May 11 11:03:18 ermintrude kernel: [  170.326480] [drm:intel_dp_start_link_train [i915]] Channel EQ done. DP Training successful
May 11 11:03:18 ermintrude kernel: [  170.326656] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:77:DP-1] Link Training Passed at Link Rate = 540000, Lane count = 4
May 11 11:03:18 ermintrude kernel: [  170.338599] [drm:i915_hotplug_work_func [i915]] Connector HDMI-A-2 (pin 6) received hotplug event.
May 11 11:03:18 ermintrude kernel: [  170.338631] [drm:intel_hdmi_detect [i915]] [CONNECTOR:82:HDMI-A-2]
May 11 11:03:18 ermintrude kernel: [  170.338866] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
May 11 11:03:18 ermintrude kernel: [  170.338885] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry

I'll add an attachment in a moment, it follows a boot up.

The system was powered up with a single DP monitor, around 1 minute into the boot, a second monitor was turned on (already connected to the other DP connector - DP-2-8).

After a few minutes, both monitors went black for about 5 seconds, then the left-hand monitor came back, but not the right-hand one (DP-2-8), which is in power-saving mode.  Here is the xrandr output:

~$ xrandr
Screen 0: minimum 320 x 200, current 7680 x 2160, maximum 8192 x 8192
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 621mm x 341mm
   3840x2160     60.00*+  30.00    25.00    24.00    29.97    23.98  
   1920x2160     59.99  
   2560x1440     59.95  
   1920x1080     60.00    60.00    50.00    50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1680x1050     59.95  
   1280x1024     60.02  
   1440x900      59.89  
   1280x960      60.00  
   1280x720      60.00    50.00    59.94  
   1024x768      60.00  
   800x600       60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-2-8 connected 3840x2160+3840+0 (normal left inverted right x axis y axis) 621mm x 341mm
   3840x2160     30.00*+  25.00    24.00    29.97    23.98  
   2560x1440     59.95  
   1920x1200     59.95  
   1920x1080     60.00    50.00    59.94    30.00    25.00    24.00    29.97    23.98  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
DP-2-1 disconnected (normal left inverted right x axis y axis)

Created attachment 139496 [details]
boot log extracts ref previous comment

Sometimes power-cycling the second monitor helps, but sometimes this make the machine lock up hard.

Recurrance with:
Linux ermintrude 4.17.0-rc6-drm-tip+ #27 SMP Tue May 22 08:54:13 UTC 2018 x86_64 GNU/Linux

Second monitor continues to intermittently flash until after next reboot.

[1848106.948820] [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00400000, dig 0x10101110, pins 0x00000040
[1848106.948850] [drm:intel_hpd_irq_handler [i915]] digital hpd port C - short
[1848106.948897] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port C - short
[1848106.949295] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 00 01 40 02 02 06 00 00 00 00
[1848106.950130] [drm:i915_hotplug_work_func [i915]] running encoder hotplug functions
[1848106.950148] [drm:i915_hotplug_work_func [i915]] Connector DP-1 (pin 6) received hotplug event.
[1848106.950177] [drm:intel_dp_detect [i915]] [CONNECTOR:78:DP-1]
[1848106.950573] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 00 01 40 02 02 06 00 00 00 00
[1848106.950847] [drm:intel_dp_print_rates [i915]] source rates: 162000, 216000, 270000, 324000, 432000, 540000
[1848106.950862] [drm:intel_dp_print_rates [i915]] sink rates: 162000, 270000, 540000
[1848106.950877] [drm:intel_dp_print_rates [i915]] common rates: 162000, 270000, 540000
[1848106.951235] [drm:drm_dp_read_desc [drm_kms_helper]] DP sink: OUI 00-00-00 dev-ID  HW-rev 0.0 SW-rev 0.0 quirks 0x0000
[1848106.951512] [drm:intel_dp_detect [i915]] Sink is not MST capable
[1848106.957250] [drm:drm_detect_monitor_audio [drm]] Monitor has basic audio support
[1848106.958426] [drm:intel_dp_start_link_train [i915]] Using LINK_BW_SET value 14
[1848106.958716] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 00000000
[1848106.958731] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 0
[1848106.958746] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
[1848106.958761] [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS1
[1848106.959337] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 04000000
[1848106.959351] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 1
[1848106.959365] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
[1848106.959931] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 07000000
[1848106.959945] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
[1848106.959959] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
[1848106.960540] [drm:intel_dp_start_link_train [i915]] clock recovery OK
[1848106.960554] [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS3
[1848106.961427] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 08000000
[1848106.961455] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
[1848106.961469] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
[1848106.962334] [drm:intel_dp_set_signal_levels [i915]] Using signal levels 08000000
[1848106.962361] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
[1848106.962375] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 1
[1848106.963240] [drm:intel_dp_start_link_train [i915]] Channel EQ done. DP Training successful
[1848106.963404] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:78:DP-1] Link Training Passed at Link Rate = 540000, Lane count = 4
[1848106.972959] [drm:i915_hotplug_work_func [i915]] Connector HDMI-A-2 (pin 6) received hotplug event.
[1848106.972977] [drm:intel_hdmi_detect [i915]] [CONNECTOR:83:HDMI-A-2]
[1848106.973212] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
[1848106.973227] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry
[1848106.973472] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
[1848106.973494] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpc
[1848106.973509] [drm:intel_hdmi_set_edid [i915]] HDMI GMBUS EDID read failed, retry using GPIO bit-banging
[1848106.973524] [drm:intel_gmbus_force_bit [i915]] enabling bit-banging on i915 gmbus dpc. force bit now 1
[1848106.976198] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpc
[1848106.976213] [drm:intel_gmbus_force_bit [i915]] disabling bit-banging on i915 gmbus dpc. force bit now 0
[1848106.976470] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0040 w(1)
[1848106.976497] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry
[1848106.976834] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0040 w(1)
[1848106.976863] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID:  (err -6)
[1848106.989637] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Update: Waiting for the FIFO underrun fixes. Currently In progress, and can try after the fixes/patches are available.

Hello, the previous comment mentions some fifo underrun fixes, was wondering if these have hit drm-tip yet?  I'm still seeing the behaviour with 5.0.0-rc3-drm-tip+ 

Thanks!

Tim.

Tim, Can you please verify the issue with latest drmtip?

I believe the root cause of the majority of these occurrences is radio frequency interference.

This particular Dell motherboard design seems to be susceptible to RFI, and research suggests that the Optiplex 5040 motherboard design was later revised by Dell to address this issue.

Installing RF chokes (ferrite cores) on all cables (e.g. USB, power, displayport) has reduced the frequency of these issues at least tenfold.