I have meanwhile  also found  a workaround for ubuntu 11.04

1. installed  linux-alsa-driver from repository ppa:ubuntu-audio-dev/ppa
see 
http://ppa.launchpad.net/ubuntu-audio-dev/ppa/ubuntu/pool/main/l/linux-alsa-driver-modules-2.6.38/

sudo add-apt-repository ppa:ubuntu-audio-dev/ppa
sudo apt-get update
sudo apt-get install linux-alsa-driver-modules-$(uname -r)

note: 
at the moment there are only packages for kernel 2.6.38-8 available


2. opened file /etc/pulse/daemon.conf and replaced 

a) entry

; enable-lfe-remixing = no

with

enable-lfe-remixing = yes

and 
b) entry

; default-sample-channels = 2

with

default-sample-channels = 6

3. opened file /etc/modprobe.d/alsa-base.conf and added

options snd-hda-intel model=basic

at the end of this file


4. opened file /etc/modules and added 

snd-hda-intel model=basic

at the end of this file

5. Then I rebooted laptop.

Subwoofer is now working unter ubuntu 11.04 (with same rich, full sound
as under Windows).

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https://bugs.launchpad.net/bugs/728161

Title:
  Laptop subwoofer is not functional on ASUS G73JH

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