Comment # 34
on bug 109628
from Chris Snook
(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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