Hi Michael,
Just adding a little more info since I have the same soundcard and codec
and am now experiencing this same issue (I'll attach my alsa-info):
00:1b.0 Audio device [0403]: Intel Corporation 82801H (ICH8 Family) HD
Audio Controller [8086:284b] (rev 02)
Subsystem: Dell Device [1028:01f3]
Codec: SigmaTel STAC9228
Having seen this bug I thought I would do some testing since I was still
on the 2.6.31-4 kernel and running pulseaudio 1:0.9.15-4ubuntu2 and
sound was working fine. First, I specifically updated just the kernel
to 2.6.31-5 and sound still worked fine. I then updated pulseaudio to
1:0.9.16~test4-0ubuntu4 and now I no longer have sound. I tried doing
"pasuspender -- rhythmbox" but still have no sound.
I notice Jamie is seeing a similar issue in bug 400682 but I don't think
these are duplicates since he experienced his loss of sound upgrading to
an earlier Karmic release whereas we just recently lost sound.
** Attachment added: "alsa-info-pulse=1:0.9.16~test4-0ubuntu4.txt"
http://launchpadlibrarian.net/30255669/alsa-info-pulse%3D1%3A0.9.16%7Etest4-0ubuntu4.txt
** Package changed: linux (Ubuntu) => pulseaudio (Ubuntu)
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[karmic] No sound on Intel 82801H HD Audio
https://bugs.launchpad.net/bugs/411574
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