Hi
Did you try to install the sound driver?
Mostly this is a solution!
The Satellite T135-S1305 is an Toshiba US notebook series.
The driver can be found here:
http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/home.jsp
The installation of Conexant Sound driver should help you.
Here is also an nice youtube video but instead Sigmatel driver you have to use Conexant driver
http://www.youtube.com/watch?v=9lZzBDkpWkk