My laptop is totally upgraded to Ubuntu 9.04 – Jaunty Jackalope after overcoming a problem with the sound not present in Ubuntu 8.10
In this link you’ll find a colection of posible solutions to sound problems with Ubuntu, I paid special attention to a section dedicated to laptops just like mine an HP Pavilion dv5 .
To work with the HP dvX you’ll need to compile some packages so be sure to install build-essential (sudo apt-get install build-essential).
Cheers 🙂