Comment # 8 on bug 1190095 from Takashi Iwai

(In reply to Axel Braun from comment #7)
> (In reply to Takashi Iwai from comment #6)
> > BTW, which kernel was the last working one?  Was it already 5.13.x?
> 
> Yes, it was 5.13.8.
> Some Plasma updates flew in between the snapshots as well - but as the
> Nvidia card seems to work, I would not consider this as the root cause.

Then please try to install again the old 5.13.8 kernel from TW history repo,
and confirm that it still works fine, ie. a kernel regression.

> I can report it, but I guess I'm lost on any question except 'what hardware
> are you using?'

Developers would ask you to provide more information with the debug option,
etc.
There is nothing different from reporting to here.