Comment # 3 on bug 1176757 from Patrik Jakobsson

I've now managed to reproduce the issue (or a different one). After installing
and uninstalling amdgpu 20.30 the system is left in a broken state.
Reinstalling Mesa-dri solves the problem for me. Not sure why your other kernel
is working (mine is not) but you can try booting into it and enter:

sudo zypper in -f Mesa-dri

Hope that helps