I have done some digging and trial and error with AMD’s amdgpu DC documentation and I found booting with amdgpu.abmlevel=0 amdgpu.dcdebugmask=0x410 kernel parameters to be an effective workaround. The problem is that this disables any and all panel power-saving features, and I can tell… my laptop can hardly reach 3 hours of work on a charge in this state.