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[Raymond <1487168@xxxxxxxxxxxxxxxxxx>]

pci 0000:00:05.0: [8086:2415] type 00 class 0x040100
 pci 0000:00:05.0: reg 0x10: [io  0xd100-0xd1ff]
pci 0000:00:05.0: reg 0x14: [io  0xd200-0xd23f]


you need to log all i/o ports read/write of those ich controller registers and ac97 codec registers read/write 

since real dell dimension 8400 ad1980 support 5.1 but using ich6
controller

the emulated ich controller only support stereo

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https://bugs.launchpad.net/bugs/1487168

Title:
  [Emulated AD1980 AC97 inside Virualbox 5.0, playback] volume slider
  problem

Status in Virtualbox:
  New
Status in alsa-driver package in Ubuntu:
  Incomplete
Status in virtualbox package in Ubuntu:
  Confirmed

Bug description:
  Volume Slider is only controlling PCM channel and is not controlling
  Master. In effect, Master is restricting the audio level to the
  default of approximately 45 Percent. In order to raise the Master
  Volume Level, alsamixer is capable of changing Master. Without
  manually raising Master to Max Volume, Volume Slider can only control
  volume from 0-45% which is the default level of Master.

  Description:	Ubuntu Wily Werewolf (development branch)
  Release:	15.10

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
  Uname: Linux 4.1.0-3-generic x86_64
  ApportVersion: 2.18-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  gene       1330 F.... pulseaudio
                        gene       1922 F.... alsamixer
  CurrentDesktop: Unity
  Date: Thu Aug 20 13:00:57 2015
  InstallationDate: Installed on 2015-08-19 (1 days ago)
  InstallationMedia: Edubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150819)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Built-in Audio - Intel 82801AA-ICH
  Symptom_Type: Volume slider, or mixer problems
  Title: [ICH - Intel 82801AA-ICH, playback] volume slider problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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