[Bug 100989] [BAT][BSW] igt at kms_pipe_crc_basic@suspend-read-crc-pipe-b hung in CI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100989

--- Comment #2 from Martin Peres <martin.peres at free.fr> ---
(In reply to krisman from comment #1)
> (In reply to Martin Peres from comment #0)
> > On CI_DRM_2600, the machine fi-bsw-n3050 hung on
> > igt at kms_pipe_crc_basic@suspend-read-crc-pipe-b.
> > 
> > This may be related to the thousands of "[drm:intel_dp_aux_ch [i915]]
> > dp_aux_ch timeout status 0x71450064" found in the logs.
> > 
> > Full logs:
> > https://intel-gfx-ci.01.org/CI/CI_DRM_2600/fi-bsw-n3050/
> > igt at kms_pipe_crc_basic@suspend-read-crc-pipe-b.html
> 
> The hpd task is completing ok as far as I understand.  we can try the patch
> that I mentioned in Bug 100215 to see if it helps[1] but I don't think it
> will fix it. 

Our system already tested it and found it was fixing the issue:
https://patchwork.freedesktop.org/series/23299/

But I guess you meant that we should apply it permanently. The only way to do
this is to get it upstream :)

> Did the system hard hanged or just the IGT task? Also did it
> get back from the suspend?  

The system hard-hanged or at least could not be reached from the network after
resume, and the controller could not read the results anymore
(https://intel-gfx-ci.01.org/CI/CI_DRM_2600/fi-bsw-n3050/igt.log).

> I think I saw some hangs while reading CRC that
> I couldn't reproduce anymore on SNB or SKLs (not sure), I'll give it another
> try.


Thanks for looking into it!

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