On Monday, 4 January 2021 10:33:47 GMT Dr Rainer Woitok wrote:

> Oh well, is there a replacement for ALSA?   Can I use "pulseaudio" with-
> out ALSA?
> 
> Sincerely,
>   Rainer

Without the alsa kernel driver available, the pulseaudio mixing controls won't 
be able to talk to the hardware.

Does 'alsactl init' report something different after a cold reboot when sound 
works as expected, as opposed to after hibernation?

Does your audio driver have a power saving function?  modinfo will show this 
and you can enable/disable it, via /etc/modprobe.d/ - see here for more info:

https://wiki.gentoo.org/wiki/Power_management/Soundcard

Do you have alsasound service configured to run at boot?  If so, does sound 
return if you restart the service after hibernation?

Another thought:  could it be the default audio device changes after restoring 
from hibernation?  What I mean is, if your audio device has PCM and HDMI 
outputs, it may be the order is reversed for some unknown reason.  If so, you 
should still have sound on one of the outputs.  In this case, you could 
hardcode the order of the audio devices in /etc/asound.conf so the desired 
audio card output is always the default.

If none of the above provide a solution, then it must be some MoBo/driver bug, 
which will need more involved debugging with the latest testing kernel 
version.