[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105300

--- Comment #15 from tempel.julian at 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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