Comment 53 for bug 1236965

the current implementation is based on the jack retasking standard of 5.1 support with 3 audio jack (line out, mic and line in ) at rear panel of desktop

http://www.intel.com/support/motherboards/desktop/sb/CS-034198.htm

it is not easy to assign your line out jack as side channel without changing the logic in function fill_multi_ios() in hda_generic.c

it still not support of 7.1 for those 5 jacks at rear panel (e.g. Intel dh67bl alc892 without grey jack)

still no channel mode switch from 6 to 8

https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/878345