I did a clean install of Hardy a while back, and to my dismay found that
with pulseaudio being the default sound system, my workaround specified
above no longer works, and reverts to 2-channel sound only.  I've tried
editing /etc/pulse/daemon.conf to add "default-sample-channels = 6"
(because PA only enables 2-channel playback by default), but I don't get
anything but 2-channel.  Even worse, trying to set the playback to use
ALSA again fails on test with the following message:

audiotestsrc wave=sine freq=512 ! audioconvert ! audioresample !
gconfaudiosink: Could not open audio device for playback.

So surround sound has been completely broken for me since.

You didn't specify a repo to add so that I can install linux-
image-2.6.27-*, so I downloaded the Intrepid alpha 5, booted into it and
still 2-channel sound only.  Edited /etc/pulse/daemon.conf as above and
ran:

killall pulseaudio
pulseaudio &

Test tone still works, but still only 2-channel, even after unmuting all
the appropriate channels.  Note that whether I'm using the installed
Hardy or live Intrepid, I get the following error when I manually
relaunch PA:

[EMAIL PROTECTED]:~$ pulseaudio &
[1] 6507
[EMAIL PROTECTED]:~$ ALSA lib control.c:909:(snd_ctl_open_noupdate) Invalid CTL 
front:0


Let me know if there's any other information I can provide.

-- 
High pitch whine on left audio channel with Asus K8N-VM
https://bugs.launchpad.net/bugs/156540
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