[Bug 102646] Screen flickering under amdgpu-experimental [buggy auto power profile]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102646

--- Comment #30 from L.Y. Sim <onlylys at protonmail.com> ---
I have this issue on a 3840x1600 Acer XR382CQK with an RX560 with Kernel
4.18.5-1 on Manjaro. 

When I set the refresh rate to 75Hz, severe artifacts and flickering appear.

Both 

    echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
and

    echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level

stop the flickering and artifacting, and I can see via 

    cat /sys/class/drm/card0/device/pp_dpm_mclk 

that the memory clocks are set to 1750Mhz and 300Mhz respectively. 

However, if /sys/class/drm/card0/device/power_dpm_force_performance_level is
set to auto, I can see (via watching /sys/class/drm/card0/device/pp_dpm_mclk
with time intervals around 0.1s), that the memory clock oscillates rapidly
between 300Mhz, 625Mhz and 1750Mhz.

So it seems to me that the rapid change in memory frequency is what's causing
the flickering.

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