I have my own report to submit. I believe this is the correct thread to do so.
I can reproduce the problem reliably. I have been experiencing it consistently for about a year now.
System: AMD Ryzen 5 PRO 2500U w/ Radeon Vega Mobile Gfx - Lenovo Thinkpad
Qubes Kernel: 5.15.103-1
There are a few things that agitate it. Most notable of which is running more than one keepassx or keepass2 at the same time in different VMs.
If lucky: After entering the appropriate password the keepass window will do a slow side-to-side (not up and down) old-school rendering blit before coming back up to full speed.
If unlucky: Display will completely seize either immediately or at some point when playing with keepass (e.g. opening an entry to edit - very annoying). The internal processes seem to continue to operate (e.g. videos / streams in background will continue to play indefinitely) but the display becomes completely unresponsive.
Attempting to switch fullscreen TTYs does nothing. No combination of hotkeys help. The mouse pointer still moves around but nothing visually responds. I also updated the chipset firmware last year to see if it would fix the problem. It did not.
I have also noticed that electrum (the bitcoin application) seems to agitate it if a keepass is open at the same time. I find myself copying entries out of keepass, closing it, and running electrum separately to avoid a display hang. Again, all in separate VMs.
I tried changing the display manager earlier on in the year prior, which did not fix it, so I rolled back to my backup. None of the kernel updates have helped so far.
I might be able to show the techs the bug by capturing the screen with a phone. I’m not sure if seeing it with ones own eyes would help though. It’s not particularly easy to capture logs because all temporal memory is lost when forcing a hard reboot on the system (along with temporary keepass edits… save often).
I saw an email address to contact someone with reports earlier in this thread. I’m not sure if that’s still appropriate. Let me know if so and I will.