[Bug 96868] AMDGPU Tonga only does 2560x1440 at 120hz, switching to 144hz causes display errors, same thing used to happen with fglrx.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96868

--- Comment #4 from Alex Deucher <alexdeucher at gmail.com> ---
Does forcing the clocks to high or low fix the issue? (as root):
echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
or
echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level

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