The Sony Vaio VPCCW17FX uses the Realteck ALC262 codec and out of the box Ubuntu 9.10 the internal microphone does not work. However the mic input jack does work.
$ cat /proc/asound/card0/codec#* | grep Codec
Codec: Realtek ALC262
Researching on the web there were a lot of folks across a lot of distrubtions having issues with this codec [...]
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