Ubuntu
alsa-driver package

  1. Bug #1120853
  2. Comment #4

Comment 4 for bug 1120853

Revision history for this message
hughbert (hughberto) wrote : Re: card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog] 5.1 surround sound unresposive or of poor quality

Heres the datasheet:
http://www.analog.com/en/audiovideo-products/audio-codecs/ad1988b/products/product.html

I think I've figured out whats going on, I think the stereo input pins are also used for 5.1 (or 7.1) surround sound.
Which means that there must be a software configuration switch on the kernel side.

So good news, If your inputs are working they should be able to switch from one to the other. In other words all I need to do is figure out a way of getting the stereo input to switch to surround sound output.