Thanks a lot for your swift reply and many Thanks to the developers!
I can not verify GUI issue reliable and reproducible because the most affected
machine is remote via ssh.
Status:
The most affected machine "Wilhelm" did NOT show the issue since about 2days.
The level is:
Linux wilhelm 5.4.0-83-generic #93-Ubuntu SMP Tue Aug 17 10:15:03 UTC 2021
x86_64 x86_64 x86_64 GNU/Linux Ubuntu 20.04.3 LTS ("proposed" enabled, NOT
applied linux-generic-hwe-20.04 since it is a production machine)
I assume the 2-day-no-crash situation on wilhelm may indicate successful
improvements.
Another affected machine will now be observed having kernel level:
Linux peter 5.11.0-33-generic #35-Ubuntu SMP Mon Aug 16 23:50:22 UTC 2021
x86_64 x86_64 x86_64 GNU/Linux 21.04 hirsute ("proposed" enabled)
Here I could apply "generic-hwe" but for 21.04 it seems to be unavailable.
A third strongly affected AMD-APU 20.04.3 LTS machine (remote, ssh) is
not in use currently (insignificance of any result). However it is now
updated to: Linux Devon 5.4.0-83-generic #93-Ubuntu SMP Tue Aug 17
10:15:03 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
If I can find any current issue I will report it.
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https://bugs.launchpad.net/bugs/1939417
Title:
Ubuntu GUI crashes (w and w/o Wayland), VM_L2_PROTECTION_FAULT,
amdgpu 0000:09:00.0: [gfxhub0] retry page fault
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