Comment 2 for bug 355747

I'm marking this as confirmed based on similar behavior on my dv7 and a workaround that could form the basis for a fix. The workaround is to add the following line to /etc/modprobe.d/alsa-base:

options snd-hda-intel enable_msi=1

I write "workaround, not fix", for at least two reasons:

1. The user should not have to do this, and, more importantly,

2. After a recent round of updates, this file disappeared for me, but it's entire contents were copied to /etc/modprobe.d/alsa-base.conf - and the problem returned! When I did "cp -p /etc/modprobe/alsa-base.conf /etc/modprobe/alsa-base" and rebooted, the problem went away, sound was good again.

In other words, sound was as described in this report, I added that line, sound was good, there were recent upgrades (between June 15 and June 22), sound went bad again, I cp'd the file as described, sound is good.

The fix would be to have this option set by default for the dv7 series. This problem is known to the community, refer to these sites:

http://forum.notebookreview.com/showthread.php?t=331172
https://help.ubuntu.com/community/SoundTroubleshooting/#Having%20sound%20issues%20with%20HP%20dvx%20laptop

Refer also to bug# 269012 - one of these may be a dupe of the other.