[Realtek ALC268] subwoofer does not work

Binary package hint: pulseaudio

hey there,

on this acer aspire 7720 running ubuntu 10.04, the subwoofer does not work. Sound is there, but tinny.
Support seems to be very generic.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: pulseaudio 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu14
ProcVersionSignature: Ubuntu 2.6.32-23.37-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-23-generic i686
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: richard 3834 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0x9b300000 irq 17'
   Mixer name : 'Realtek ALC268'
   Components : 'HDA:10ec0268,1025011e,00100003 HDA:14f12c06,1025011e,00100000'
   Controls : 11
   Simple ctrls : 8
Date: Wed Jul 21 15:14:59 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SelectedCard: 0 Intel HDA-Intel - HDA Intel
SourcePackage: pulseaudio
Symptom: audio
Title: [Realtek ALC268] PA test tone failed (alsa tone succeeded)
dmi.bios.date: 01/05/2008
dmi.bios.vendor: Acer
dmi.bios.version: V1.27
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Poyang
dmi.board.vendor: Acer
dmi.board.version: V1.27
dmi.chassis.type: 1
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.27
dmi.modalias: dmi:bvnAcer:bvrV1.27:bd01/05/2008:svnAcer:pnAspire7720:pvrV1.27:rvnAcer:rnPoyang:rvrV1.27:cvnAcer:ct1:cvrV1.27:
dmi.product.name: Aspire 7720
dmi.product.version: V1.27
dmi.sys.vendor: Acer