Well, my machine is quite new: AMD Ryzen 5 2600 on an ASRock B450m Pro4 Mainboard. BIOS Version is 3.30 (21.5.2019). There are existing newer versions, but they are not recommended with my processor generation (only newer). But the strange thing is that other Distros boot fine. I don't know what's the difference between openSUSE and the others and how to troubleshoot this?