Here's something interesting:
This is the output just after I've logged in:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ja 1659 F.... pulseaudio
When I open the sound preferences applet:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ja 1659 F.... pulseaudio
/dev/snd/pcmC0D0c: ja 1659 F...m pulseaudio
When I close the applet, the output to the command goes back to the
first one.
I've installed some non-free codecs/plugins (for mp3 and aac files) and
I've noticed that the sound hardware is slower to disappear since I did
that. (Which is why I can close the applet before the sound disappears.)
But it does eventually if I leave the applet open - takes a minute or
two.
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Hardware device disappearing from Sound Preferences
https://bugs.launchpad.net/bugs/465942
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