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

[khitschler]

Back to freeze on resume.

I'm running Ubuntu 18.04.4 LTS on a Lenovo Desktop V530-15ARR with AMD
Ryzen 5 2400G with Vega 11 Graphics and a kernel 5.3.0-28-generic.

With a kernel 5.0.0-29 suspend and resume were perfect (from the users point of view). But I had sometimes graphic freezes during normal usage like browsing. So I upgraded the kernel to 5.3.0-28. This kernel shows suspend and resume problems. 
I think I've found a workaround for the failing suspend described at https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe/+bug/1851054 . But now resume sometimes traps into a black screen. 

It seems that only the first resume after a cold start fails. When
resume fail I'm able to login via SSH and to initiate a reboot.
Subsequent suspend and resumes do survive. Since I've repeated only a
few times the same experiment I'm not 100% sure about this.

Working resume: Please see attachment suspend-resume-ok.txt

Failing resume: Please see attachment suspend-resume-blank-screen,txt

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

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