finally solve. after upgrading to Hardy and partitioning my hard drive and installing windows and trying to run the audio drivers now my audio works. i didn’t mess with any settings all i did was to uncheck the “External Amplifier” and the audio worked like new.

i found this at this post http://www.backports.ubuntuforums.org/showthread.php?t=161193&page=2 post #13.

hope this helps, good luck.