(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)

Hello iuno, is there a easy way to achieve setting clock.default_dispclk to 625
Mhz? like setting dpm performance level to high?

I'm using radeon open source driver with Asus R9 390X / MG279Q on Ubuntu 17.04.
120hz is working fine with dpm performace level high. 144hz has blurry image
and one faulty line on the left side

Thank you.