https://bugs.freedesktop.org/show_bug.cgi?id=107855
--- Comment #3 from Christian König ckoenig.leichtzumerken@gmail.com --- (In reply to Pontus Gråskæg from comment #2)
This behaviour occurs with *both* the kernel command line having amdgpu.dc=1 *AND* amdgpu.dc=0 - in other words the old radeon driver is also having problems here.
Sounds like a misunderstanding here: amdgpu.dc=0 does NOT select the older radeon driver, instead it just disables the DC code base in amdgpu.