[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 #34 from bmilreu at gmail.com ---
(In reply to Mike Bendel from comment #33)
> I'm also experiencing the same issues, but on much lower refresh rates. I
> have a 3840x1600 monitor (LG 38UC99) and when running at 75Hz, display
> corruption is observed on both AMD GPUs I have, a Radeon Pro WX 5100 and
> Radeon RX 550.
> 
> Fortunately, setting the power level to high makes the display corruption go
> away entirely, but also raises temperatures substantially. The idle temp on
> my WX 5100 gets up to 60 C by doing that.
> 
> Is there a way to lower the clocks in the high performance state? I know
> some  utilities like MSI Afterburner allow for this in Windows, but I'm not
> sure how to do it on Linux.

Those two commands will force only the mclk to high state, which should get rid
of the bug and for me the temperature difference then is negligible compared to
forcing both clocks to high.

echo "manual" > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo "2" >  /sys/class/drm/card0/device/pp_dpm_mclk

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