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

[Mike Lykov]

I see the miracle :)
according https://01.org/blogs/rzhang/2015/best-practice-debug-linux-suspend/hibernate-issues

I try two options:
1.  initcall_debug
2. echo 0 > /sys/power/pm_async

Before I can reproduce the bug each time I press power button for
suspend/resume (after resume I have a black screen with in 100% times
when conditions described above satisfied).

then I try to disable pm_async and after suspend/resume I have no this
bug. BUT, after restoring pm_async value to 1 via reboot, I cannot
reproduce bug anymore. It is not happen in same situation as earlier.

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

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