Comment # 64
on bug 91880
from Alex Deucher
(In reply to Julian from comment #63) > At first I thought it was an issue with the writeback feature that caches > certain register values because it also caches an rptr value that is used in > the driver's gpu_lockup_check and is, to my knowledge, never actually > written to. More likely it never gets written because the GPU has hung due to something else. > > Buuut using radeon.no_wb=1 doesn't help. So if I've found a bug it is not > the culprit of the lockups. The no_wb option isn't really applicable on newer chips and most likely won't work. Newer hw does not support the necessary features to not support wb. It's mainly a leftover from the early radeons.
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