I had the same issue with C910 camera + mic.

I make it work using comment #123 solution, just the alsa-base.conf 
modification, did not install any backported module. 
on  3.2.0-23-generic #36-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux 
Ubuntu 12.04

I might add that in Ubuntu Sound preferences I've two input device,
referring to that only device. If I keep the first selected, as in
attached screenshot, it works. If I switch to the second one, it got
back to the usual issue.


** Attachment added: "screenshot6.png"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/843431/+attachment/3073063/+files/screenshot6.png

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https://bugs.launchpad.net/bugs/843431

Title:
  Logitech camera microphone does not work / makes "chipmunk" sound

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