Since beginning of September the bug disappeared for me. I'm not sure
what update caused it but the usual suspects are: linux-
image-5.4.0-45-generic:amd64 (5.4.0-45.49~18.04.2, automatic) with its
kernel module amdgpu.ko or some xorg-...-hwe parts or a combination of
them.
But I tried with a boot of a kernel 5.3.0-40 and the bug emerged again.
So it is more likely that it was a kernel related problem.
I have to note that I removed the line with "EnablePageFlip" within the
configuration file "/usr/share/X11/xorg.conf.d/10-amdgpu.conf" of my
suggested workaround #54 like this:
Section "OutputClass"
Identifier "AMDgpu"
MatchDriver "amdgpu"
Driver "amdgpu"
EndSection
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https://bugs.launchpad.net/bugs/1849084
Title:
Freeze on system-resume caused by kwin and amdgpu driver
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