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Fixing sound problem with HP Pavilion dv3 laptop and Ubuntu

I left work so for the first time in many, many years had to supply myself with my own laptop. I picked the HP Pavilion DV3-1075US 13.3-Inch Laptop (Amazon link -- btw, with the rebate it's about $50 less than what I paid for it at Fry's. Fry's had it for $50 off and then another $50 rebate) because it was really light with a decent (small) sized screen, but not too small.

It comes with Vista. I hate the idea of having paid for a Microsoft operating system, but I was in a rush and couldn't readily find any systems that came with Linux installed that I could get immediately. If I had to do it over again, I'd buy the Dell XPS M1330n (link to Dell Inspiron and XPS laptops that come with Ubuntu installed -- scroll to the bottom for the M1330n) that comes with Ubuntu installed on it. The dimensions are roughly the same as is the price.

I installed Ubuntu on it and the sound was muted. I checked the alsa mixer and unmuted anything that was muted, checked System->Preferences->Sound, checked the volume, etc...followed all the troubleshooting steps I could find. Turns out the fix was a simple one line addition to a conf file. I searched for all sorts of obvious things on Google, then finally searched on "ATI Technologies Inc RS780 Azalia controller", the audio device displayed by executing $ lspci (list all PCI devices) and that took me to No Sound on 9.04 with ATI RS780 Azalia on the kubuntu forum which led me to instructions on fixing my sound issue:

One line edit to /etc/modprobe.d/alsa-base.conf. Add options snd-hda-intel model=dell-m4-2 enable_msi=1 to the end of the file and reboot. When you reboot, you'll notice the red muted speaker icon will turn white and then you'll know it worked.