Looks like it's available now:
https://lists.ubuntu.com/archives/kernel-team/2009-October/007611.html
Please try installing the linux-backports-modules-alsa-karmic-generic
and see if this helps.
** Changed in: linux (Ubuntu)
Status: Triaged => Incomplete
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mic not working on dell vostro 1310 1400 with hda intel (gutsy and hardy)
https://bugs.launchpad.net/bugs/188972
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