Comment # 15 on bug 1190090 from Mathias Homann

(In reply to Takashi Iwai from comment #14)

> So it indicates that the breakage is in the kernel level.  Or the mixer
> setup got screwed by some reason.
> 
> On Linux console without pulseaudio or pipewire running, login as root, and
> unload snd_soc_skl_hda_dsp module.
>   modprobe -r snd_soc_skl_hda_dsp
> 
> Then remove /var/lib/alsa/asound.state.  Reload or reboot, and retest the
> raw aplay again.

...that did it.

Sound is back, on the console and in KDE/Plasma.

THANK YOU!!!!!

If we ever happen to meet face to face there is a beer with your name on it.
Possibly more than one.