Comment # 56 on bug 1177428 from Christian Hartmann

(In reply to Takashi Iwai from comment #54)
> (In reply to Karl Mistelberger from comment #53)
> > (In reply to Takashi Iwai from comment #51)
> > > Please test just a simple update of kernel-firmware-amdgpu package from:
> > >  
> > > http://download.opensuse.org/repositories/home:/tiwai:/test:/fw-fix/
> > > openSUSE_Factory/noarch/kernel-firmware-amdgpu-20201005-336.1.noarch.rpm
> > 
> > I reverted to broken firmware first by running zypper dup.
> 
> Actually I wonder whether the boot still fails at this moment after zypper
> dup.
> If the problem was some hard-link mess via the update, it might work
> magically even without fixing anything else, just because you once
> uninstalled and cleaned up.

If I'm not wrong, this would also explain the behaviour I faced when trying the
old firmware releases and switching back to 20.40 still worked fine.