View source for Sound On ION based systems

[[Category: Tutorials]]
Some people might find the following blog post helpful.
== How to enable ALSA Analog 5.1 Sound on Nvidia ION ==

I recently had the problem to enable 5.1 Sound with 3 click outputs on an Nvidia ION board. By default Linux configures it with only one plug configured as output. After some research I found a solution in the OpenSUSE Wiki you have to set during module loading to get it working.
Basically you have to add

 options snd-hda-intel model=3stack-6ch enable=1 index=0

to your modeprobe.conf to tell the driver to use all its 3 plugs as output. After you loaded the modules like this, alsamixer will show you all the 6 channels, so you can unmute them.

Source: [http://pascal.nextrem.ch/2009/10/31/how-to-enable-alsa-analog-5-1-sound-on-nvidia-ion/ Pascal's Blog]

== HDMI ==
To be able to use audio over HDMI, the following requirements have to be met:
* alsa 1.0.19
* snd-hda-codec-nvhdmi has to be loaded before snd-hda-intel
* Unmute IEC958 mixer

Maybe the following has to be added to /etc/asound.conf
 pcm.!default hdmi:NVidia

Source: [http://www.nvnews.net/vbulletin/showpost.php?p=1991314&postcount=12 nV News Forum]