Comment # 12 on bug 93288 from Jacinto

I added an attachment I might be hitting the same bug. With 4.7 the screen will
artifact some white squares and then it will hard lock , I had to hard reboot.
With 4.8 there are no artifacts It will freeze, and after a while I can get to
tty dmesg show the same message.

[drm:ci_dpm_enable [radeon]] *ERROR* ci_start_dpm failed [drm:radeon_pm_resume
[radeon]] *ERROR* radeon: dpm resume failed