This turned out to be the root cause of a sound issue I was having.
After updating to latest jaunty this morning and manually re-adding
"options snd-hda-intel model=mitac" to enable my 82801H [8086:284b]
audio chip (bug #210865), I found that alsa had re-muted my Front and
other channels.
On reboot sound acted as if it were muted, but I was quite confused that
alsamixer showed only a single channel, unmuted and at full volume. (My
System/Preferences/Sound applet is missing and I've no idea what
happened to it, but that's a separate issue).
I found by killing pulseaudio, I could unmute in alsamixer, restart
pulseaudio, and everything worked again. I also tested using alsamixer
-c 0 and believe that should do it too.
alsamixer -c 0 is nice to learn about and something I'll definitely keep
in my back pocket for future troubleshooting. However, this doesn't
seem to be a very discoverable solution to this problem.
** Changed in: pulseaudio (Ubuntu)
Importance: Undecided => High
Target: None => jaunty-alpha-4
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'Front' and 'PCM' mixer control elements must be unmuted by default on HDA
platforms
https://bugs.launchpad.net/bugs/315971
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