I have the same laptop & the same problem (except that I am using the x86_64 
version of Hardy).
After a lot of research, I finally found a cure which worked for me.
In alsa-base, add the following line:

options snd-hda-intel model=laptop-micsense

Now the sound works as it should!

-- 
[regression] Intel 82801G outputs no sound anymore through audio cinch (laptop 
speaker still work)
https://bugs.launchpad.net/bugs/229522
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