Known issue with no ETA for fix. There are different models you can pass to snd-hda-intel when it's loaded. Have you tried "laptop-eapd"?
** Changed in: alsa-driver (Ubuntu)
Sourcepackagename: alsa-driver => linux-source-2.6.15
Importance: Untriaged => Medium
Status: Unconfirmed => Confirmed
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No ALSA sound output on Acer Travelmate 3020
https://launchpad.net/bugs/51341
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