[Bug 1849084] Re: Freeze on system-resume caused by kwin and amdgpu driver

[khitschler]

P.B. I tried to verify your observation. Without luck. First I generated
a Windows-10 bootable USB drive and managed to install and run the "AMD
Driver Auto-detect tool". On Windows it was successful to set the
computer into standby and resume. Then I've done a warm-start of the
computer an booted into Linux. Now I was able to set the machine into
standby and back to resume successfully.

The next experiment was to do a power down reset and try the
standby/resume with Linux again. It stopped with a blank black screen
with backlight switched on. After a warm start (Alt-SysReq-B) all
subsequent standby/resume cycles worked perfectly.

My guess is that after a warm start some GPU register settings remain
untouched causing success of the resume. Or in other words, the initial
setup of the GPU is missing something which is done with the first
(unsuccessful) standby/resume after power up.

My ubuntu kernel version is meanwhile 5.3.0-46-generic.

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Title:
  Freeze on system-resume caused by kwin and amdgpu driver

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