https://bugs.freedesktop.org/show_bug.cgi?id=106175
--- Comment #84 from Michel Dänzer michel@daenzer.net --- (In reply to Nicholas Kazlauskas from comment #81)
As for the difference between dc=1 and dc=0, that might just be a difference in behavior on the DRM level for atomic vs non-atomic drivers. Or a difference in userspace if they make a distinction there.
xf86-video-amdgpu doesn't, FWIW.