[Bug 108503] Display flashes when PSR enabled on gen9

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108503

--- Comment #11 from Ronald <ronald at innovation.ch> ---
(In reply to Jose Roberto de Souza from comment #10)
> Hi Ronald
> 
> I have a few things for you to test to me:
> 
> - can you check if your userspace is not trying to mirror or extend your
> desktop to 2 monitors? if so disable one. By the logs I can see that both
> GPUs have one CRTC and one plane enabled so maybe the mux is not working and
> both GPUs are driving/trying to drive the same panel
I'm quite sure the userspace is not mirroring/extending, and that the gmux is
working correctly. However, I believe what you're seeing is probably due to the
fact that the dGPU (AMD), and only the dGPU, is wired up to the external DP (in
order to use an external monitor the dGPU has to be enabled - e.g. I usually
power down the dGPU to save power (via vgaswitcheroo), but have to power it
back up if I want to use an external monitor).

> - can you disable the AMD GPU in BIOS or blacklist the module and test it?
Done: no change. (blacklisted the module, verified it didn't show up in lsmod
after boot and /sys/kernel/debug/vgaswitcheroo was not present anymore).

> - can you apply this patch
> https://bugs.freedesktop.org/attachment.cgi?id=142181 on top of drm-tip and
> test it?(with AMD GPU still disabled)
Done: slightly worse: seems to flicker a bit faster.

> - can you apply this patch
> https://bugs.freedesktop.org/attachment.cgi?id=142181 on top of drm-tip +
> https://patchwork.freedesktop.org/series/50843/ and test it?(with AMD GPU
> still disabled)
Done: slightly worse than series-only, in that it appears to be harder to get
the display to render (e.g. while typing in the encrypted-disk password early
in boot the display stays blank, whereas with series-only it will flash on as I
type).

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