Comment # 7
on bug 95308
from Marek Olšák
Can you please do this: - Disable GPU reset by adding this kernel parameter: radeon.lockup_timeout=0 - Reproduce the GPU hang. - CTRL+F1. This should switch to text mode successfully if you've disabled GPU reset. You can't got back to X now. - Save the contents of dmesg. - Reboot Attach dmesg here. If dmesg doesn't contain a VM fault, you don't have to do anything else for now. If dmesg contains a VM fault, set this environment variable and start the game: R600_DEBUG=check_vm (If it's a steam game, you must get the correct steam run command, which can be obtained from the desktop shortcut. For me, it looks like this: steam steam://rungameid/440 ; Make sure Steam isn't running, then run "R600_DEBUG=check_vm steam steam://rungameid/$number" where $number is the game number) After you reproduce the hang again, reboot and attach the new files located in ~/ddebug_dumps/. Those should be records of VM faults created by R600_DEBUG=check_vm. I can't promise I will be able to fix this. The issue is kinda random and it may be fixed by a later kernel or Mesa release.
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