From the ALSA wiki
Revision as of 14:13, 5 January 2007 by Ingomueller.net
If you VIA sound card does not work, type at the terminal window:
lspci -nv | grep -1 0401
Then find your card below, and set the correct module DXS setting.
1 )Class 0401: 1106:3059 (rev 50) Subsystem: 15bd:1001 Default module option for dxs_support works fine. If sound is not working, distorted, or not loud enough Set all 4 VIA DXS mixers to 100%. master mixer to 74%, pcm also to 74%
If your sound is distorted, mute the IEC958 channel.