Comment # 67
on bug 110674
from Tom B
I had a look around at similar bugs and came across this: https://bugs.freedesktop.org/show_bug.cgi?id=110822 It's for a 580, not a VII but the problems started at 5.1 and gives a similar powerplay related crash. The suggested fix there is to revert ad51c46eec739c18be24178a30b47801b10e0357. I just tried this and after 4 reboots I can report it has two effects: 1. I don't have any crashing at all and my card boosts GPU clocks, voltages and wattages. I can run unigine-heaven for several minutes without the system freezing. 2. The memory is forced to 351mhz, limiting performance. If I run cat /sys/class/drm/card0/device/pp_dpm_mclk it shows: 0: 351Mhz * 1: 801Mhz 2: 1001Mhz Which looks correct for idle, but it never, even under load, boosts to the next memory clock. It also can't be set manually: echo manual > /sys/class/drm/card0/device/power_dpm_force_performance_level echo 2 > /sys/class/drm/card0/device/pp_dpm_mclk -bash: echo: write error: Invalid argument While this isn't a proper fix it does give us some valuable insight. If anyone wants to run at 351mhz memory with a stable card and 2 screens they can. It would be nice if someone can verify my findings as my card seemed to behave differently to others for some reason. This bug may be related to https://bugs.freedesktop.org/show_bug.cgi?id=110822 alternatively, it's possible the crash occurs when the memory clock changes (which might mean it's related to https://bugs.freedesktop.org/show_bug.cgi?id=102646 as there are issues with memory clock changes there) There seem to be several powerplay related issues which may have the same root cause. I'm now going to: 1. Revert to the stock kernel and set the mclk to 1001 manually before starting SDDM and see if the crash occurs. 2. See if I can manage to get stability and the mclk stuck at 1001mhz as this would be an acceptable compromise, even if not ideal.
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