the card only support 8 channels and does not support 6 channels ,

Simple mixer control 'Speaker',0
  Capabilities: pvolume pswitch pswitch-joined penum
  Playback channels: Front Left - Front Right - Rear Left - Rear Right - Front 
Center - Woofer - Side Left - Side Right
  Limits: Playback 0 - 197
  Mono:
  Front Left: Playback 158 [80%] [-7.32dB] [on]
  Front Right: Playback 158 [80%] [-7.32dB] [on]
  Rear Left: Playback 158 [80%] [-7.32dB] [on]
  Rear Right: Playback 158 [80%] [-7.32dB] [on]
  Front Center: Playback 158 [80%] [-7.32dB] [on]
  Woofer: Playback 158 [80%] [-7.32dB] [on]
  Side Left: Playback 158 [80%] [-7.32dB] [on]
  Side Right: Playback 158 [80%] [-7.32dB] [on]

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/693039

Title:
  Pulseaudio is not running, Stereo only despite 5.1 card installed

Status in “pulseaudio” package in Ubuntu:
  New

Bug description:
  Binary package hint: pulseaudio

  Stereo only despite USB CM106 5.1 card installed.

  Report generated by

  #ubuntu-bug audio

  command

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: pulseaudio 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu21.1
  ProcVersionSignature: Ubuntu 2.6.35-23.41-generic 2.6.35.7
  Uname: Linux 2.6.35-23-generic i686
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  tomfil     1297 F.... pulseaudio
   /dev/snd/controlC0:  tomfil     1297 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'I82801DBICH4'/'Intel 82801DB-ICH4 with AD1981B at irq 11'
     Mixer name : 'Analog Devices AD1981B'
     Components : 'AC97a:41445374'
     Controls      : 28
     Simple ctrls  : 20
  Card1.Amixer.info:
   Card hw:1 'default'/'USB Sound Device         at usb-0000:00:1d.0-1, full 
speed'
     Mixer name : 'USB Mixer'
     Components : 'USB0d8c:0102'
     Controls      : 14
     Simple ctrls  : 6
  Date: Tue Dec 21 15:12:36 2010
  InstallationMedia: Ubuntu-Netbook 10.10 "Maverick Meerkat" - Release i386 
(20101007)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=pl_PL.UTF-8
   SHELL=/bin/bash
  SourcePackage: pulseaudio
  Symptom: audio
  Title: Pulseaudio is not running
  dmi.bios.date: 09/07/2004
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 1.40
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Version A0
  dmi.chassis.asset.tag: 0000000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: Version 1.0
  dmi.modalias: 
dmi:bvnTOSHIBA:bvrVersion1.40:bd09/07/2004:svnTOSHIBA:pnPortablePC:pvrVersion1.0:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: Portable PC
  dmi.product.version: Version 1.0
  dmi.sys.vendor: TOSHIBA

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