This bug also affect to me.
I have the same sound card  VT1708/A [Azalia HDAC] (VIA High Definition Audio 
Controller) (rev 20).

This bug appear on Ubuntu 10.04 and 10.10.

In random time (eg. after restart, after hibernation), the sound
appears.

Here you have logs when sound is not working.

** Attachment added: "alsa-info.not_working.txt"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/664785/+attachment/1765965/+files/alsa-info.not_working.txt

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https://bugs.launchpad.net/bugs/664785

Title:
  VT1708/A [Azalia HDAC] (VIA High Definition Audio Controller) had sound in 
10.04, not 10.10

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