On my Dell Inspiron 630m (pre-Feisty), I had to add the same line Lionel mentioned. On Feisty, it's autodetected. Can you try adding that line, and also check if it's autodetected in Feisty?
** Changed in: linux-source-2.6.17 (Ubuntu)
Status: Unconfirmed => Needs Info
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Microphone input doesn't work on Dell XPS m1210
https://launchpad.net/bugs/89181
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