Comment 179 for bug 178442

> What would I have to do, if I want to switch output to channels 3&4 (where I connected headphones)

Just to gather information, what is the soundcard that allows for this configuration?

> In Ubuntu 10.10, I mad a mapping in via-ice1712.conf which looked like this

It seems to me like that workaround would work equally well in 11.04.

You can also modify /usr/share/alsa/cards/ICE1712.conf to output to both 1&2 and 3&4 simultaneously by inserting ttable entries, should be something like:

 ttable.0.2 1
 ttable.1.3 1

...next to the other ttable entries in the definition you want to modify.