I have a T110 with Ubuntu 10.10 and have the same problem. The internal mic 
doesn't work. External mic and headphones do work. This bug existed in Ubuntu 
10.04 and in 9.10.

In 9.10 there was a workaround using

gnome-alsamixer

There are a number of Mics shown. Mic B was selected. selecting Mic F
would enable the internal mic.

10.04 broke this fix, but installing linux-backports-modules-alsa-lucid-
generic reenabled this workaround.

Sound card:

$cat /proc/asound/card0/codec#* | grep Codec
Codec: Conexant CX20582 (Pebble)
Codec: Intel Cantiga HDMI

-- 
Microphone not working on Toshiba T130-15F [Conexant CX20582]
https://bugs.launchpad.net/bugs/665302
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