Comment 7 for bug 318637

You might want to try a clean installation and the workaround suggested on http://forum.notebookreview.com/showthread.php?t=331172

As root (sudo, su, however you prefer to get there), edit the file /etc/modprobe.d/alsa-base and add this line to the end of the file:

options snd-hda-intel enable_msi=1

Then reboot.

Please note that recent updates (applied between June 15, when I first did the above, and June 22), caused the file to disappear - its entire contents were copied to /etc/modprobe.d/alsa-base.conf. When this happened, I was back to choppy sound. I restored sound by

sudo cp -p /etc/modprobe.d/alsa-base.conf /etc/modprobe.d/alsa-base

and rebooting.

Refer also to bug# 269012 and bug# 355747, and to https://help.ubuntu.com/community/SoundTroubleshooting/#Having%20sound%20issues%20with%20HP%20dvx%20laptop