I have just installed the latest distribution of Ubuntu (11.10), in my Asus netbook and -what a pitty- built in microphone is not working on Skype and also the speaker sound is worse. Seems something is wrong with the installed drivers.
I have a ASUS 1005 HA, with the same problem. The following worked for me.
or check the following: The ACER 1810 T has the same issue.