@Daniel, perhaps it is...I'll get the log for you (can't reboot at the
moment, trying to get some work done).  However, it's the EXACT same
issue that has been described by others here who have provided verbose
logs and for whom, so far as I can tell, there has been no explanation
other than the one provided by Igor that it is HAL which may be
defective by design.  To wit, the first user to log in sees the audio
device under Hardware in Sound Preferences; any other user who
subsequently logs in while the first user is still logged in sees no
hardware device for audio, and thus there is no sound for those users.
If the first user logs out, the audio device is freed up and can be
grabbed by another user when "switched" to.  One of two things *should*
be taking place and isn't:  either the audio device should be freed up
when a user switch occurs, or the audio device should be always
available to all users.  The current behaviour where it seems the first
user gets an exclusive lock on the device is not correct.

-- 
[Karmic] Only one user has sound; no hw shows in Sound Preferences
https://bugs.launchpad.net/bugs/433654
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