This is a very frustrating problem and I haven't found a fix yet myself. The 
computer I have is an HP Compaq nc6320. 
Here are some details from my setup:
 lspci |grep Audio
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition 
Audio Controller (rev 01)
 aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 6: Si3054 Modem [Si3054 Modem]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

pulseaudio is currently server version 0.9.16 (upgraded from PPA per comment 
#11 above)
Default Sink: auto_null
Default Source: auto_null.monitor
linked to library version 0.9.16
compiled with library vrsion 0.9.14

System>Preferences>Sound>Hardware> no device shown
System>Preferences>Sound>Output> Dummy Output (Stereo)

I was going to try some settings from #13 above but I don't see that
setting... Can you elaborate on "Does your user have permission via
PolicyKit or otherwise to access @audio?" My user is an administrator
user and all privileges are checked in the User Manager.

The only way I have been able to get sound is by modifying 
/etc/modprobe.d/alsa-base.conf , adding the text below and then running 'sudo 
alsa force-reload'
options snd-hda-intel model=AD198x

The above workaround only works between reboots and apparently uses alsa
instead of pulseaudio.

Any ideas? I hope this gets fixed by release time because the Intel
graphics are working a lot better in the Karmic version and I'd hate to
not be able to recommend the upgrade.

Thanks!
Shannon VanWagner

-- 
[karmic] pulseaudio: card not found - Null Output / Dummy Output
https://bugs.launchpad.net/bugs/394500
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