Alex, thanks. Could you try the following:
1) Install Maverick
2) Install daily ALSA snapshot 
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules 
3) Add the following line to /etc/modprobe.d/alsa-base.conf <--- this line is 
new compared to the previous instruction
options snd-hda-intel model=ideapad
4) Reboot 
5) Try again and indicate independently whether
 - headphones are working
 - internal mic is working
 - external mic is working
6) Supply an alsa-info

Sorry if I'm causing work for you by asking you to test again and again;
it's a little difficult to do remote debugging on this one, so an option
could be to ship the machine to me.

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https://bugs.launchpad.net/bugs/497546

Title:
  Microphones not working on Dell Vostro 320

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