I see from your alsa-info script run that you are using a custom kernel.
Could you please try the latest prebuilt kernel from the Ubuntu karmic
repo and let me know if the problem still persisits?
affects ubuntu/alsa-driver
status incomplete
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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udev [karmic] 143 does not create /dev/snd/pcm*
https://bugs.launchpad.net/bugs/398279
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