I did some Google searching in various forums and Sony Vaio sound problems
go back as far as Gutsy. There are various fixes that have been tried and
some have worked for some and not for others.

http://ubuntuforums.org/showthread.php?t=677746
www.geoffcorey.com/setup-sony-vaio-laptop-internal-microphone-ubuntu-9-10\
-vpccw17fx/