Thank you for taking the time to report this bug and helping to make
Ubuntu better.  I would start here :

Note 1. Intrepid users: due to a bug in the ALSA libraries, your PCM
mixer may occasionally become muted or reset to 0% volume. If you cannot
hear sound - or hear a faint crackling - refer to Part C, Step 3.

Part C

3. Ensure that your sound card's PCM mixer is not muted or set to 0%
volume (this appears to be a bug in Intrepid):

Code:

$ alsamixer -Dhw

Note: When the PulseAudio ALSA plugins are active, you must explicitly
specify your hardware device in alsamixer (marked in blue above),
otherwise it will open the PulseAudio mixer.

4. Log out & back in for changes to take effect!

That is from this thread:
http://ubuntuforums.org/showthread.php?p=4928900

additionally you may try:

https://wiki.ubuntu.com/DebuggingSoundProblems

and report your findings back here.

-- 
No Sound
https://bugs.launchpad.net/bugs/313053
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