https://bugzilla.kernel.org/show_bug.cgi?id=201539
--- Comment #8 from Tony Chaveiro (tchavei@gmail.com) --- (In reply to Alex Deucher from comment #7)
Does setting amdgpu.dpm=1 on 4.19 help? The default dpm implementation changed between 4.18 and 4.19.
amdgpu.dpm=1 produces black screen (unable to boot) in both 4.18 and 4.19. Using amdgpu.dc=1 produces error and freeze on boot