Actually, it should not be a plain shutdown -h now. Instead, 
gnome-power-manager should be handling the shutdown (which is faster and lacks 
the sound) according to the /etc/acpi/powerbtn.sh script:
# If gnome-power-manager, kpowersave or klaptopdaemon are running, let
# them handle policy This is effectively the same as 'acpi-support's
# '/usr/share/acpi-support/policy-funcs' file.

if pidof gnome-power-manager kpowersave > /dev/null ||
  (pidof dcopserver > /dev/null && test -x /usr/bin/dcop && /usr/bin/dcop kded k
ded loadedModules | grep -q klaptopdaemon) ; then
    exit
fi
[truncated kde script]
# If all else failed, just initiate a plain shutdown.
/sbin/shutdown -h now "Power button pressed"

But for some reason, using the power button is faster by a few seconds.
Just for informational purposes. :)

-- 
Shutdown sound is truncated
https://launchpad.net/bugs/61530

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