I also have this problem on a Lenovo ThinkPad Z60m with an Intel
soundcard (using the snd-hda-intel driver).

Sound only works from a cold start, not from resuming from hibernation.
I've tried gstreamer-based and xine-based players.

Backstory: upgraded to Feisty, sound stopped working.  Reinstalled
Feisty from scratch, sound worked. Installed ESD and sound stopped
working.  Removed ESD, still no sound. Installed latest ALSA from ALSA
project website (v1.0.14rc3), which at least had alsaconf utility that
has helped me with similar problems w/Debian Etch.  Still no sound.
Added "options snd-hda-intel index=0" to modprobe.d, set other indices
to -2, and it only works with a cold start.  (I should probably remove
"options snd-hda-intel index=0" from modprobe to see if that's unrelated
to this.)

Also, I'm using XUbuntu, as many others here are.


** Attachment added: "dmesg output from cold start"
   http://librarian.launchpad.net/7410616/dmesg-cold.txt

-- 
Sound doesn't work after restart, only works on cold boot
https://bugs.launchpad.net/bugs/57141
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