Description of problem:
We used to have 4 channel sound working on a Kontron 986LCD
m/ITX-board with onboard sound:
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition
Audio Controller (rev 01)
 
But that was before the upgrade from 2.6.20 -> 2.6.22

Version-Release number of selected component (if applicable):
kernel-2.6.22.2-42.fc6

How reproducible:
100%

Steps to Reproduce:
1. speaker-test -Dplug:surround40 -c4
  
Actual results:
Sound in front L, R, silence in rear L, R.

Expected results:
Sound in all 4 speakers.

Additional info:
Booting back into 2.6.20, and everything works fine.