Well, I can certainly get your audio working (maybe). I wrote the driver for most of the HP DV series systems.
First, I would recommend a newer distro, like FC7, Sese 10.2, or (my favorite) Mandriva Spring edition.
At any rate, you need to be running the latest alsa-driver 1.0.14. To determine the version you have, open a terminal window and type "cat /proc/asound/version". Anything less than 1.0.14, and you'll need to upgrade.
I have a build evironment that is fairly automated. You can download it here
. You need to install the kernel-devel packages to build it, and you will also need to be root. Just untar it to /usr/src, cd into the directory and type "make". If the build goes ok, you can type "audio_install" to upgrade your system (driver, libs, and utils).
Let me know if you run into issues with this step.