Compiled last AMD-drm-next kernel from git and problem's still here, even
worse, it's now flickering everywhere at 75hz.
Discovered from another bug report that forcing clocks to high "fixed" the
flickering, and it does indeed.
It also doesn't flicker if I force 60hz everywhere. It's worth mentioning its a
1080p Freesync 75hz DP1.2 monitor.