[Bug 109628] WARNING at dcn10_hw_sequencer.c:868 dcn10_verify_allow_pstate_change_high()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109628

--- Comment #34 from Chris Snook <chris.snook at gmail.com> ---
(In reply to Chris Snook from comment #33)
> (In reply to Johannes Hirte from comment #28)
> > From the reports, it seems to be compositor related. For me, kwin with
> > OpenGL 3.1 backend works fine. xfwm4 seems to trigger the bug, maybe other
> > compositors too.
> 
> Confirmed that the workaround of switching to the kwin OpenGL 3.1 compositor
> works for me.
> 
> kernel: 5.3.0-19-generic (Ubuntu 19.10)
> window manager: kwin-x11 4:5.16.5-0ubuntu1
> CPU: Ryzen Pro 2500U
> machine: Lenovo Thinkpad A485
> X server: xserver-xorg 1:7.7+19ubuntu12
> userspace driver: xserver-xorg-video-amdgpu 19.0.1-1ubuntu1
> 
> I'm happy to test patches or reproduce.

I may have spoken too soon. I'm non-deterministically experiencing the basic
symptom of hang on resume with a blank screen, sometimes with the backlight on
and sometimes without, but I no longer get the traceback in logs, so I can't
tell if it's mostly the same bug but without tripping the failure mode that
causes it to log, or if there's an unrelated suspend/resume bug. Switching to
the OpenGL 3.1 compositor has definitely made that error message stop appearing
in my logs though.

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