I have the same problem too. My box is, HP dv5000, sound device -
Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller. I think that Intel should have some new stuff for Microsoft Windows 7 as it is not the same case as with Ubuntu 6.10 and it's wireless card from Broadcom company that never cared about Linux. I got answered by them in an email where they told me strictly, they do not care doing any specials for Linux.
I am working with my Ubuntu 9.04 and waiting to test and compare it with windows 7 at the same time that I hear some music, any help?
I got it working !
HP website for drivers - downloaded the sound driver for vista, it upgraded itself and bingo, it works.
Link:
Link Removed - Invalid URL Let me know if it helped you.