https://bugs.freedesktop.org/show_bug.cgi?id=108031
--- Comment #4 from Alex Deucher alexdeucher@gmail.com --- (In reply to Alex Deucher from comment #3)
Remove amdgpu.dpm=1 from your kernel command line. The default dpm implementation changed in 4.19.
and setting dpm=1 overrides that resulting in different behavior. power management is always enabled by default. the dpm option is only for debugging and switching between implementations for asics that contain multiple implementations.