There is also a workaround that doesn't require patching the kernel, maybe this 
is of help to someone experiencing the problem right now.
Create a file  /etc/acpi/resume.d/66-snd-hda-intel.sh that contains:

#!/bin/sh
# workaround resume bug on 2.6.20 (fixed in .22)
# see https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/100114
# this requires xserver-xorg-core to be installed, which is usually the case
pcitweak -w 00:1b:0 0x44 0

and make it executable (`chmod a+x /etc/acpi/resume.d/66-snd-hda-intel.sh`)
Please check that your audio controller is indeed on address 00:1b:0 using ` 
lspci | grep 'High Definition Audio Controller' `; if not, adjust accordingly.

-- 
snd-hda-intel: distorted sound after resume, until the module is reloaded
https://bugs.launchpad.net/bugs/100114
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