I get this like every day and my 'search forum' skills are terrible...
How about using external search engine?
This works in Duck for example:
imac sound site:forum.zorin.com
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I'm still not be able to fix anything, but here's some stuff that I think might be useful.
The grey dash line (the thing that go up and down when volume increase/decrease -- i don't know what's it called) seem to freeze around 10sec after I launch the setting, but in pulse control it's still working completely fine.
unmute S/PDIF and Disable Mute doesn't seem to do anything.
My guess is that suspend the computer change something to the default output speaker and the display, which is audio disappear after suspending the computer, and toggling the brightness slider become usable again. Also, by locking the computer and login again doesn't have the same effect as suspend(audio is still working, but can't change volume, and brightness slider not working).
Another thing to mention:
sudo alsa force-reload gives me this
which I'm not sure if it's an error or not, because someone reply in this post that this fix the problem no sound after suspend, but I did mine and the problem still occur...
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