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

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Comment # 11 on bug 96868 from
(In reply to Alex Deucher from comment #4)
> 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

I did this test and I can confirm that if I set
power_dpm_force_performance_level to high or log the flickering stops.
So at 144Hz with power_dpm_force_performance_level set to auto there is
flickering.
With power_dpm_force_performance_level set to high or low this bug is not
present.


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