Okay, let's revisit this one. Looking at the code and the codec, it looks like  
model=ideapad *should* have worked for the mic stuff (as suggested in #33). 
Could you please verify:
 - Install Maverick
 - Install https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules
 - reboot
 - verify that the neither internal nor external mic is working
 - paste an alsa-info into the bug, with the external mic plugged in? 
https://wiki.ubuntu.com/Audio/AlsaInfo

Thanks!

Further research gives an explanation to my comment #42 is that in
Karmic had no special support for this codec, which meant that a generic
driver was used instead. This generic "fallback" driver is seldom used,
but in this case it seemed to have worked ok...

** Changed in: alsa-driver (Ubuntu)
       Status: Triaged => Incomplete

** Changed in: alsa-driver (Ubuntu Lucid)
       Status: Triaged => Incomplete

** Changed in: alsa-driver (Ubuntu Maverick)
       Status: Triaged => Incomplete

-- 
Microphones not working on Dell Vostro 320
https://bugs.launchpad.net/bugs/497546
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