I was able to fix my sound problem in up-to-date Hardy Heron following a
guide from the German magazine FreiesMagazin
(http://www.freiesmagazin.de), June 2008, on page 19:

1) Create the following file: /etc/modprobe.d/snd-hda-intel.modprobe
2) Append at the end of the file following entry: options snd-hda-intel 
model=3stack-dig
3) Append at the end of the file /etc/modprobe.d/alsa-base following entry: 
options snd-hda-intel model=3stack-dig
4) Edit following file: /etc/default/acpi-support and change the following 
entry:

# Add services to this list to stop
# them before suspend and restart
# them in the resume process.
STOP_SERVICES="alsa"

5) Reboot your computer

After this, sound worked for me after suspend to ram and hibernation.
Note that the model in the above entry has to match the sound chip in your 
computer. Intel high definition audio (HDA) allows for different chips to be 
used. Your chip can be found via following command:

$ aplay -l

A list of drivers can be found in following file:

$ zless /usr/share/doc/alsa-base/driver/ALSA-Configuration.txt.gz

There are usually several options, try them all to find your matching
driver.


OS: Kubuntu / Ubuntu Hardy Heron
Hardware: Core2 Duo T7300, Intel Santa Rosa, i965 graphics chipset
Laptop: Littlebit Sepia X35 (Asus Z37E)

-- 
After hibernate, sound doesn't work
https://bugs.launchpad.net/bugs/25896
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