> That PPA does not have natty packages so I can't try it.

Ah, sorry. And the DKMS stuff isn't really ready either so let's skip
this idea for now.

> Do you have any other suggestions?

Well, the best thing I guess would be if we actually get the first internal mic 
working. Could you try
1) installing snd-hda-tools from ppa:diwic/ppa (I'll upload a natty version of 
that package later today)
2) Make sure "internal mic" is selected in alsamixer (not "Internal Mic 1")
2) run "sudo hda_analyzer"
3) go to node 0x0b
4) make sure Input amps are turned up, and experiment with different values of 
"VREF" and see if that helps.

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https://bugs.launchpad.net/bugs/731706

Title:
  [Dell Studio 1558] Not Able to Select Correct Microphone Input
  "Internal Mic 1"

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