I'm using Karmic with some ppa(s) : alsa & pulseaudio backports from
Lucid because i was having hard freezes due to alsa (karmic release).

But .xsession-errors is flooded by:
-  ALSA lib pcm_dmix.c:1010:(snd_pcm_dmix_open) unable to open slave
and continue to freeze the system.

My codec is Realtek ALC882 & card is HDA Intel

Googling around, i've installed alsamixer  to choose the right hardware
(hda intel) instead of "default": that stopped the freeze problem. But
still having pulseaudio complaint:

pulseaudio[2756]: sink-input.c: Failed to create sink input: sink is suspended.
pulseaudio[2756]: alsa-sink.c: Error opening PCM device front:0  busy ressource 
or hardware.

So, there is a problem with Alsa settings (use "default" instead of
detecting hardware and codec).

-- 
[karmic] No sound on Intel 82801H HD Audio
https://bugs.launchpad.net/bugs/411574
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