I don't have too much time right now but I did the test with previous
kernels 3.2 (leftover from Precise) and 3.4 and here's the results:

- 3.2:  sound works fine, even after many suspends
- 3.4:  system hangs at lightdm stage (no response at all), just before the 
usual Ubuntu sound theme is played it seems.

I also tried to with gdm + gnome-shell (so no lightdm and no Unity), and
the problem still occurs with the Quantal kernel.

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https://bugs.launchpad.net/bugs/1066353

Title:
  No sound after suspend (Ubuntu 12.10 64bit)

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