Comment 182 for bug 178442

I don't have any problems with this bug anymore on Natty. So I can confirm that this is fixed for me with alsa-lib - 1.0.24.1-0ubuntu4.

@ David Henningsson
Thank you for your tip with the ttable entries. I was not possible to make a mapping through via-ice1712.conf (but perhaps I just did something wrong), but changing /usr/share/alsa/cards/ICE1712.conf works to allow simultanuous output on channels 1-4. Here the relevant section in /usr/share/alsa/cards/ICE1712.conf, where I added the two lines you suggested:
<confdir:pcm/front.conf>

ICE1712.pcm.front.0 {
 @args [ CARD ]
 @args.CARD {
  type string
 }
 type asym
 playback.pcm {
  type route
  ttable.0.0 1
  ttable.1.1 1
  ttable.0.2 1
  ttable.1.3 1

Thanks a lot