Comment # 5 on bug 1188685 from Takashi Iwai

Could you try to install the recent upstream kernel from OBS
Kernel:stable:Backport repo, and check whether the problem persists?
  http://download.opensuse.org/repositories/Kernel:/stable:/Backport/standard/

Just download kernel-default-5.13.*.rpm, and install it manually.  Note that
Secure Boot wont' work with this kernel.

If the same problem still exists, we need to hunt for the bug, and better to
report to the upstream via sof-project github issues.

BTW, YaST2 sound configuration is nowadays a pretty obsoleted feature, rather
harmful to use on modern systems due to being error-prone.  I'm considering to
propose either giving a warning dialog or dropping it.

Another note: when you run alsamixer to access the raw ALSA device, pass either
-c with a card number (e.g. 0) or -Dhw:0.  Otherwise it's routed to PulseAudio
via pulse plugin.