At least for me I found a reproducible workaround for the resume bug. I
found it more or less with try and error.
I added the option "EnablePageFlip" to the configuration file
"/usr/share/X11/xorg.conf.d/10-amdgpu.conf" like this:
Section "OutputClass"
Identifier "AMDgpu"
MatchDriver "amdgpu"
Driver "amdgpu"
Option "EnablePageFlip" "off"
EndSection
and restarted. With this option set my computer always return from
suspend. I do not really know about the impact of "EnablePageFlip" but I
do not feel any significant degradation of video performance.
Maybe this will help to catch the annoying bug.
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which is subscribed to xserver-xorg-video-amdgpu in Ubuntu.
https://bugs.launchpad.net/bugs/1849084
Title:
Freeze on system-resume caused by kwin and amdgpu driver
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