[Bug 91883] [HSW, BDW, SKL] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91883

Ander Conselvan de Oliveira <conselvan2 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |conselvan2 at gmail.com

--- Comment #41 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
(In reply to Maarten Lankhorst from comment #40)
> Created attachment 128451 [details] [review]
> Move LUT until after vblank evasion.
> 
> Does this fix the bug for those that have the issue with vblank taking a
> long time? 100+ us.

I gave this patch a try using the kms_pipe_color color igt test. In a 100 runs
of the ctm-red-to-blue-pipe0, without this patch I would get the "Atomic update
failure" message roughly 5. With the patch I haven't seen the message, even
after repeating the experiment a few times.

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