I found this workaround on the web:

1) sudo gedit /etc/modprobe.d/alsa-base.conf

2) add the following at the end of the file:

options snd-hda-intel model=dell-s14

3) restart and the internal microphone should work.

It works for maverick 64-bits and probably also for lucid

I think an official fix should be released for this problem

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Basically useless audio input on Dell M4500
https://bugs.launchpad.net/bugs/656133
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