I have a Hp Pavilion dv5 laptop and was having sound problems. I have Linuxmint 7 64 bit, which is based on Jaunty Jackalope (Ubuntu 9.04)
I found this article at https://help.ubuntu.com/community/SoundTroubleshooting which can also help you with HP dv models.
The latest alsa-driver snapshot provides a fix for this issue.
Get it here and do below:
cd ~ mkdir src cd src mkdir alsa cd alsa wget ftp://ftp.kernel.org/pub/linux/kernel/people/tiwai/snapshot/alsa-driver-snapshot.tar.gz tar -xvpf alsa-driver-snapshot.tar.gz cd alsa-driver ./configure sudo make sudo make install-modules Edit this file sudo gedit /etc/modprobe.d/alsa-base.conf
and add this entry at the bottom "options snd_hda_intel model=hp-dv5" without the quotes.