Apr 22 19:45:43 xw8600 kernel: [100726.465447] ------------[ cut here ]------------
Apr 22 19:45:43 xw8600 kernel: [100726.465451] unknown DP link rate 0, using 6
Apr 22 19:45:43 xw8600 kernel: [100726.465478] WARNING: CPU: 1 PID: 11478 at drivers/gpu/drm/drm_dp_helper.c:142 drm_dp_link_rate_to_bw_code+0x42/0x50
Apr 22 19:45:43 xw8600 kernel: [100726.465479] Modules linked in: rfcomm ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_addrtype br_netfilter bridge stp llc ebtable_nat iptable_nat nf_nat_ipv4 nf_nat ebtables vfio_pci vfio_virqfd vfio_iommu_type1 vfio fuse snd_seq_midi btusb btbcm btintel bluetooth uvcvideo videobuf2_vmalloc ecdh_generic videobuf2_memops videobuf2_v4l2 videodev snd_usb_audio videobuf2_common snd_usbmidi_lib snd_rawmidi joydev wmi_bmof coretemp kvm_intel kvm irqbypass pcspkr rt2800pci eeprom_93cx6 firewire_ohci rt2x00pci rt2800mmio rt2x00mmio firewire_core crc_itu_t rt2800lib radeon rt2x00lib mptsas mptscsih ttm mptbase scsi_transport_sas i5k_amb wmi
Apr 22 19:45:43 xw8600 kernel: [100726.465527] CPU: 1 PID: 11478 Comm: kworker/1:1 Tainted: G        W        4.16.2-gentoo-xw8600-fj #1
Apr 22 19:45:43 xw8600 kernel: [100726.465528] Hardware name: Hewlett-Packard HP xw8600 Workstation/0A98h, BIOS 786F5 v01.46 09/20/2012
Apr 22 19:45:43 xw8600 kernel: [100726.465569] Workqueue: events radeon_hotplug_work_func [radeon]
Apr 22 19:45:43 xw8600 kernel: [100726.465573] RIP: 0010:drm_dp_link_rate_to_bw_code+0x42/0x50
Apr 22 19:45:43 xw8600 kernel: [100726.465574] RSP: 0018:ffffa21649ce7ce8 EFLAGS: 00010286
Apr 22 19:45:43 xw8600 kernel: [100726.465576] RAX: 0000000000000000 RBX: ffff8bf0ca1b4e00 RCX: 0000000000000001
Apr 22 19:45:43 xw8600 kernel: [100726.465577] RDX: 0000000080000001 RSI: ffffffff8b0036ba RDI: 00000000ffffffff
Apr 22 19:45:43 xw8600 kernel: [100726.465579] RBP: ffff8bf0ca1b4600 R08: 0000000000000001 R09: 000000000000053c
Apr 22 19:45:43 xw8600 kernel: [100726.465580] R10: 0000000000000000 R11: 000000000000053c R12: ffff8bf0c4a9a000
Apr 22 19:45:43 xw8600 kernel: [100726.465581] R13: ffff8bf0ca1b4e00 R14: ffff8bf0c6424000 R15: ffff8bf0ca1b4e00
Apr 22 19:45:43 xw8600 kernel: [100726.465583] FS:  0000000000000000(0000) GS:ffff8bf0efc40000(0000) knlGS:0000000000000000
Apr 22 19:45:43 xw8600 kernel: [100726.465584] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Apr 22 19:45:43 xw8600 kernel: [100726.465586] CR2: 00007f7715284008 CR3: 000000075ff7c000 CR4: 00000000000006e0
Apr 22 19:45:43 xw8600 kernel: [100726.465587] Call Trace:
Apr 22 19:45:43 xw8600 kernel: [100726.465612]  radeon_dp_link_train+0x1d1/0x5f0 [radeon]
Apr 22 19:45:43 xw8600 kernel: [100726.465636]  radeon_atom_encoder_dpms_dig+0x211/0x4f0 [radeon]
Apr 22 19:45:43 xw8600 kernel: [100726.465652]  ? atombios_blank_crtc+0x140/0x140 [radeon]
Apr 22 19:45:43 xw8600 kernel: [100726.465672]  radeon_atom_encoder_dpms+0xaf/0x110 [radeon]
Apr 22 19:45:43 xw8600 kernel: [100726.465675]  drm_helper_encoder_dpms+0x34/0x70
Apr 22 19:45:43 xw8600 kernel: [100726.465678]  drm_helper_connector_dpms+0x7a/0xe0
Apr 22 19:45:43 xw8600 kernel: [100726.465695]  radeon_hotplug_work_func+0x48/0x70 [radeon]
Apr 22 19:45:43 xw8600 kernel: [100726.465701]  process_one_work+0x135/0x390
Apr 22 19:45:43 xw8600 kernel: [100726.465703]  worker_thread+0x45/0x3d0
Apr 22 19:45:43 xw8600 kernel: [100726.465706]  kthread+0xf0/0x130
Apr 22 19:45:43 xw8600 kernel: [100726.465708]  ? process_one_work+0x390/0x390
Apr 22 19:45:43 xw8600 kernel: [100726.465710]  ? kthread_create_on_node+0x60/0x60
Apr 22 19:45:43 xw8600 kernel: [100726.465713]  ? SyS_exit+0xe/0x10
Apr 22 19:45:43 xw8600 kernel: [100726.465717]  ret_from_fork+0x35/0x40
Apr 22 19:45:43 xw8600 kernel: [100726.465720] Code: 00 74 33 81 ff d0 78 02 00 b8 06 00 00 00 74 26 48 83 ec 08 89 fe ba 06 00 00 00 48 c7 c7 e0 7a 04 8b 88 44 24 07 e8 de b1 b1 ff <0f> 0b 0f b6 44 24 07 48 83 c4 08 c3 66 90 55 48 89 fd 53 48 89 
Apr 22 19:45:43 xw8600 kernel: [100726.465759] ---[ end trace b6f9739952c34c80 ]---
Apr 22 19:45:43 xw8600 kernel: [100726.479412] [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed: 5 tries
Apr 22 19:45:43 xw8600 kernel: [100726.479433] [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed
Apr 22 19:46:18 xw8600 root: ACPI event unhandled: jack/lineout LINEOUT unplug