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

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

--- Comment #58 from qqel@outlook.com --- (In reply to iuno from comment #55)

Make sure to raise the DC clock above the default value, e.g. to 625 MHz (value 62500)

If you use amdgpu: in amdgpu_atombios.c adev->clock.default_dispclk If you use radeon: in atombios_crtc.c rdev->clock.default_dispclk

That should fix the broken image. To fix flickering, set mclk to high (echo 1 > /sys/class/drm/card0/device/power_dpm_force_performance_level)

Confirming that this fixed the issue! MG279Q, r9 290 with amdgpu. Didn't have to touch the mclk.