Public bug reported:

All sounds in (k)ubuntu 9.10 (amd64) are played over the internal
subwoofer (on a clean install). (haven't tested on 32-bit version)

i could fix the problem by upgrading alsa driver and changing the options in 
the alsa-base.conf to
options snd-hda-intel model=laptop

ProblemType: Bug
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  stephan    2244 F.... knotify4
                      stephan    2287 F.... kmix
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xdb100000 irq 36'
   Mixer name   : 'IDT 92HD75B3X5'
   Components   : 'HDA:111d7603,103c7001,00100202'
   Controls      : 20
   Simple ctrls  : 12
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xd3000000 irq 38'
   Mixer name   : 'Nvidia ID a'
   Components   : 'HDA:10de000a,10de0101,00100100'
   Controls      : 0
   Simple ctrls  : 0
Card1.Amixer.values:
 
Date: Wed Jan 27 17:14:40 2010
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: alsa-base 1.0.20+dfsg-1ubuntu5
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-17.54-generic
SourcePackage: alsa-driver
Uname: Linux 2.6.31-17-generic x86_64

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug

-- 
HP DV8-1050EG - All sounds are played over subwoofer
https://bugs.launchpad.net/bugs/513337
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