[Bug 107543] Video cutout on Kaby Lake U processors.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107543

--- Comment #21 from Dan Booker <dan.booker at adder.com> ---
(In reply to Rodrigo Vivi from comment #18)
> Hi Dan,
> 
> The i915.enable_psr=0 is not doing anything actually. First because PSR is
> an eDP only feature and you have no eDP, according to your display_info. But
> also becuase i915.enable_psr=0 is no op because i915.enable_psr defaults to
> 0 anyways by default in all current platforms.
> 
> Maybe it was the fbc the one you thought it is helping. But anyways, if you
> still see the issue with that =0 it is only masking the real issue. So could
> you please retest latest drm-tip without any modified parameter?
> 
> Also, question, how many memory do you have on your system?
> I wonder if this series would help you:
> https://patchwork.freedesktop.org/series/46481/
> 
> Also, what is the CPU/GPU load that you are using? Media? 3D?

See above for output with drm-tip and no parameters set.

On the Celeron system I'm currently using I have a single stick of 4GB
DDR4-2133
but we also see the error on the i3 system with 2 sticks of 4GB DDR4-2133.

The easiest way to trigger the error is to create high CPU load by rebuilding a
linux kernel using make. However the error has also occurred when the system is
idling. Our intended load is using the CPU to decode a video stream and GPU to
display it a 2160p which can also trigger the issue.

I will take a look at the suggested patch.

Dan

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