Bug 102832 - [BAT][BXT] igt@kms_flip@basic-flip-vs-wf_vblank Failed assertion: 3 * stddev / mean < 0.005
Summary: [BAT][BXT] igt@kms_flip@basic-flip-vs-wf_vblank Failed assertion: 3 * stddev ...
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: DRI git
Hardware: Other All
: highest normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL: https://bugs.freedesktop.org/show_bug...
Whiteboard: ReadyForDev
Keywords: have-backtrace
Depends on:
Reported: 2017-09-18 06:08 UTC by Marta Löfstedt
Modified: 2017-10-11 10:51 UTC (History)
3 users (show)

See Also:
i915 platform: BXT
i915 features: display/DSI

Desriptive programing (19.47 KB, application/vnd.openxmlformats-officedocument.wordprocessingml.document)
2017-09-18 14:05 UTC, mahesh
no flags Details

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:

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.

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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