Bug 102832

Summary: [BAT][BXT] igt@kms_flip@basic-flip-vs-wf_vblank Failed assertion: 3 * stddev / mean < 0.005
Product: DRI Reporter: Marta Löfstedt <marta.lofstedt>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED WORKSFORME QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: highest CC: intel-gfx-bugs, mahesh1.kumar, mreddyh.it
Version: DRI gitKeywords: have-backtrace
Hardware: Other   
OS: All   
URL: https://bugs.freedesktop.org/show_bug.cgi?id=102832
Whiteboard: ReadyForDev
i915 platform: BXT i915 features: display/DSI
Attachments:
Description Flags
Desriptive programing none

Description Marta Löfstedt 2017-09-18 06:08:24 UTC 
The fi-bxt-dsi fail on igt@kms_flip@basic-flip-vs-wf_vblank

IGT-Version: 1.19-gc718ba80 (x86_64) (Linux: 4.13.0-CI-CI_DRM_3087+ x86_64)
Using monotonic timestamps
Beginning basic-flip-vs-wf_vblank on pipe A, connector DSI-1
  1920x1200 60 1920 1960 2000 2040 1200 1204 1208 1212 0xa 0x8 148350
Expected frametime: 16667us; measured 16625.7us +- 6.118us accuracy 0.11%
vblank interval differs from modeline! expected 16666.5us, measured 16626us +- 6.118us, difference 40.8us (6.7 sigma)

full data:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3087/fi-bxt-dsi/igt@kms_flip@basic-flip-vs-wf_vblank.html

Note this has test has also previously failed when we had the. "*ERROR* Video mode command 0x00000041 send failed." see BUG 102404. I.e. failed results precedes dmesg-warn.

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3077/fi-bxt-dsi/igt@kms_flip@basic-flip-vs-wf_vblank.html
Comment 1 mahesh 2017-09-18 13:57:09 UTC 
im send the url once check it
Comment 2 mahesh 2017-09-18 14:05:51 UTC 
Created attachment 134316 [details]
Desriptive programing

once check the details
Comment 3 Marta Löfstedt 2017-09-19 07:52:13 UTC 
(In reply to mahesh from comment #2)
> Created attachment 134316 [details]
> Desriptive programing
> 
> once check the details

Could you explain what above is adding to the solution of this bug?
Comment 4 Maarten Lankhorst 2017-10-09 11:23:33 UTC 
Considering how it's failed, I would say the accuracy of our emulated scanline timestamp might not be enough. If this only happened once I would say monitor it a bit longer only?
Comment 5 Vidya Srinivas 2017-10-09 14:19:07 UTC 
On rc14 (latest drm tip), https://patchwork.kernel.org/patch/9938311/ is merged. We no longer see this error: ERROR* Video mode command 0x00000041 send failed.

Could someone please check on tip again to see if this message is seen?
Comment 6 Jani Saarinen 2017-10-11 08:26:15 UTC 
This message is not seen. So I assume got fixed when changes were merged for that error.
Comment 7 Marta Löfstedt 2017-10-11 10:51:10 UTC 
Note seen ob BAT since at least: CI_DRM_3132

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