https://bugs.freedesktop.org/show_bug.cgi?id=105300
--- Comment #15 from tempel.jul...@gmail.com ---
Issue still exists with current 4.21-wip kernel.
As a workaround, it's enough to force the highest VRAM clock state (Forcing
higher clocks on the GPU itself is not necessary.):
echo "manual" > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo "2" > /sys/class/drm/card0/device/pp_dpm_mclk
Odd side note: It doesn't help to overclock the lower VRAM pstates to the same
clocks and voltages as the highest one.
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