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Ubuntu ALSA Audio Driver
Updating ubuntu to the latest ALSA sound driver

The easy way:
Follow the thread below and download the shell script which will do it all for you.

The manual way:
Steps for installing ALSA 1.0.20 from source.
0. Open a terminal and enter the following commands
sudo -s
mkdir /usr/src/alsa
cd /usr/src/alsa/
1. Downloading and extracting the source
wget ftp://ftp.alsa-project.org/pub/driver/alsa-driver-1.0.20.tar.bz2
wget ftp://ftp.alsa-project.org/pub/lib/alsa-lib-1.0.20.tar.bz2
wget ftp://ftp.alsa-project.org/pub/utils/alsa-utils-1.0.20.tar.bz2
wget ftp://ftp.alsa-project.org/pub/plugins/alsa-plugins-1.0.20.tar.bz2
tar xjvvfp alsa-driver-1.0.20.tar.bz2
tar xjvvfp alsa-lib-1.0.20.tar.bz2
tar xjvvfp alsa-utils-1.0.20.tar.bz2
tar xjvvfp alsa-plugins-1.0.20.tar.bz2
2. Preparing your system for compilation
apt-get build-dep alsa-driver alsa-lib alsa-utils alsa-plugins
3. Compiling alsa-X (repeat for each package)
cd alsa-X-1.0.20/
make install
4. Reboot
5. Right click on the volume icon and click on open volume settings, click advanced and enable the switches (forgot what they were called, windows disk is plugged in and its 11pm).
6. Once you've followed these steps you should be able to select the entry in Sound preferences for digital audio and you'll have sound coming through the optical SPDIF. If you're not using HDMI it may already be coming out of it (mine defaulted to HDMI as my HDMI cable was plugged in).

Hope this helps. Good luck!
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