Solution: Sound problems Ubuntu 9.04 Jaunty Jackalope and HP Pavilion dv5

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 :)