I have tried switching to AMDGPU using kernel parameters:
radeon.si_support=0
radeon.cik_support=0
amdgpu.si_support=1
amdgpu.cik_support=1
-> no effect
also tried:
nomodeset -> lspci doesn't list any driver in use
radeon.modeset=0 -> no boot/video
Any more ideas? Pls halp...