Just fyi - I moved back from home:Herbster0815 to Tumbleweed 24.0.3 with all MESA / Vulkan packages. After the move, I can confirm that - radeon.si_support=0 - amdgpu.si_support=1 did not help for whatever reason (still ended up in a black screen) whereas - modprobe.blacklist=radeon - amdgpu.cik_support=1 solved the issue so far. The GPU is obviously back to work - the computer runs far more smoothly, and the CPU load is reduced significantly.