[Bug 93826] 2560x1440 @144Hz graphic glitches and bad refresh rate

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93826

--- Comment #74 from kees.aarts1 at hotmail.com ---
I have come here since my first git bisect learned me that commit
09be4a5219610a6fae3215d4f51f948d6f5d2609 causes problems on my system. I have a
RX 460 and LG 38UC99-W and 3840x1600 @ 60hz gives no problem

Running at 75hz (freesync) worked fine on 4.12-rc2 (I used 4.12 since at 4.11
or lower I could not use the displayport at all and was limited to 30hz via
hdmi). But rc3 and up gave me flickering at the lowest +-7cm of the screen if
something changes on the screen. A git bisect brought me to the commit
mentioned above.

echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
fixes the problem on 4.12-rc6
echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level
also fixes the problem (did not expect that)
echo auto > /sys/class/drm/card0/device/power_dpm_force_performance_level
gives flickering..

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