Public bug reported:

Ubuntu 11.04 amd64
Tried test tone in sound preferences.... 
Tab Output: Internal Audio Stereo. Connector: Headphones
Tab Harware: Internal Audio 1output/1 input Analog Stereo Duplex
I hear only the rear speakers, not the front.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: alsa-base 1.0.24+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: VT1718S Analog [VT1718S Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  bert       1401 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf7ef8000 irq 41'
   Mixer name   : 'VIA VT1718S'
   Components   : 'HDA:11064428,18496718,00100100'
   Controls      : 32
   Simple ctrls  : 19
Card1.Amixer.info:
 Card hw:1 'Cable'/'USB Midi Cable at usb-0000:00:1d.0-1.1, full speed'
   Mixer name   : 'USB Mixer'
   Components   : 'USB15ca:0101'
   Controls      : 0
   Simple ctrls  : 0
Card1.Amixer.values:
 
Card2.Amixer.info:
 Card hw:2 'NVidia'/'HDA NVidia at 0xfbffc000 irq 17'
   Mixer name   : 'Nvidia GPU 11 HDMI/DP'
   Components   : 'HDA:10de0011,10de0101,00100100'
   Controls      : 16
   Simple ctrls  : 4
Date: Wed May 18 19:19:33 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel failed
Symptom_Card: Internal Audio - HDA Intel
Symptom_DevicesInUse: 1401
Symptom_Jack: Green Headphone Out, Front
Symptom_Type: No sound at all
Title: [To Be Filled By O.E.M., VIA VT1718S, Green Headphone Out, Front] No 
sound at all
UpgradeStatus: Upgraded to natty on 2011-05-02 (15 days ago)
dmi.bios.date: 10/08/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P2.80
dmi.board.name: H55DE3
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP2.80:bd10/08/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH55DE3:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

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


** Tags: amd64 apport-bug natty

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https://bugs.launchpad.net/bugs/784755

Title:
  [To Be Filled By O.E.M., VIA VT1718S, Green Headphone Out, Front] No
  sound at all

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