Hi,
I recently experienced the same "bug" when updating the kernel on my 
gentoo-box. I traced the problem to the official kernel patch 2.6.27.9 (your 
-11-version seems to be ubuntu-specific, since 2.6.27.11 doesn't exist on 
kernel.org) found here: 
http://www.kernel.org/pub/linux/kernel/v2.6/patch-2.6.27.9.bz2
The driver for the audigy sound card (emu10k1) was updated, they swapped the 
digital-analog switch of the volume control. 

To address this, start "alsamixer" in a console-window. Go to the
"Audigy Analog/Digital Output Jack"-item and make sure it is set to "MM"
(mute). The switch can be triggered using the "m"-key. Hit Escape to
store the settings.

You might also find this switch in the Gnome Sound Settings.

-- 
no sound with kernel 2.6.27-11 and audigy2 zs
https://bugs.launchpad.net/bugs/310179
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