Fix headphone audio output on Linux on HP ProBook 6450b

The headphone output on my HP ProBook 6450b on Ubuntu Linux stopped working a few updates ago and I think I've found how to fix it:

cd /usr/share/pulseaudio/alsa-mixer/paths
sudo cp analog-output-headphones.conf analog-output-headphones.bak
gksudo emacs analog-output-headphones.conf

Turn on the master volume (it was 'mute'):

[Element Master]
switched = on

Ensuring the fan runs on my HP ProBook 6450b laptop

I have an HP ProBook 6450b laptop which runs Ubuntu 12.10 and Windows 7. It had a tedious and potentially expensive problem: when running Linux, the CPU fan would fail to turn on until the CPU temperature reached 105℃. This was dangerously hot. I wrote about the problem in detail on the Ubuntu Forum, including links to my conversations on the linux-acpi kernel list.

After spending about a month trying to find a software fix for this problem, I decided it was time to get the soldering iron out to fix the problem. Here's what I did:

Notes on running Ubuntu Linux on my HP ProBook 6450b


To get the wifi to work correctly, I had to do sudo apt-get remove --purge bcmwl-kernel-source  source

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