Lots of questions, I'll attempt to answer as best as I can.

First. Host OS Level:
uname -a
Linux gwsux79 3.13.0-62-generic #102-Ubuntu SMP Tue Aug 11 14:29:36 UTC
2015 x86_64 x86_64 x86_64 GNU/Linux

Second, Sound Card/Sound Support: I don't understand the question about
"Real Sound Card Support 5.1".

Onboard Audio Intel Motherboard DX79SI The following URL is documentation
for the Motherboard.
https://downloadmirror.intel.com/20560/eng/DX79SI_TechProdSpec06.pdf

Third question asks Which Audio Backend is being used for VirtualBox 5.0?
I take the the defaults(Audio) for installing any Guest OSes. When I look
at the Settings for the guest I reported this issue, it lists
Host Driver: PulseAudio
Controller: ICH AC97

I hope this answers your questions.

On Thu, Aug 20, 2015 at 11:19 PM, Raymond <email address hidden>
wrote:

> those emulated sigmatel ac97 codec inside virtualbox 4.x support stereo
> only
>
> which host os are you using linux/windows ?
>
> do you have a real sound card support 5.1 ?
>
> which audio backend do your virtualbox5.0 using ?
>
> it seem that the emulated ad1980 ac97 support multi channel
>
> profiles:
>                 input:analog-stereo: Analog Stereo Input (priority 60,
> available: unknown)
>                 output:analog-stereo: Analog Stereo Output (priority 6000,
> available: unknown)
>                 output:analog-stereo+input:analog-stereo: Analog Stereo
> Duplex (priority 6060, available: unknown)
>                 output:analog-surround-21: Analog Surround 2.1 Output
> (priority 800, available: unknown)
>                 output:analog-surround-21+input:analog-stereo: Analog
> Surround 2.1 Output + Analog Stereo Input (priority 860, available: unknown)
>                 output:analog-surround-40: Analog Surround 4.0 Output
> (priority 700, available: unknown)
>                 output:analog-surround-40+input:analog-stereo: Analog
> Surround 4.0 Output + Analog Stereo Input (priority 760, available: unknown)
>                 output:analog-surround-41: Analog Surround 4.1 Output
> (priority 800, available: unknown)
>                 output:analog-surround-41+input:analog-stereo: Analog
> Surround 4.1 Output + Analog Stereo Input (priority 860, available: unknown)
>                 output:analog-surround-50: Analog Surround 5.0 Output
> (priority 700, available: unknown)
>                 output:analog-surround-50+input:analog-stereo: Analog
> Surround 5.0 Output + Analog Stereo Input (priority 760, available: unknown)
>                 output:analog-surround-51: Analog Surround 5.1 Output
> (priority 800, available: unknown)
>                 output:analog-surround-51+input:analog-stereo: Analog
> Surround 5.1 Output + Analog Stereo Input (priority 860, available: unknown)
>                 off: Off (priority 0, available: unknown)
>         active profile: <output:analog-stereo+input:analog-stereo>
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1487168
>
> Title:
>   [Emulated AD1980 AC97 inside Virualbox 5.0, playback] volume slider
>   problem
>
> Status in alsa-driver package in Ubuntu:
>   New
>
> 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
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1487168/+subscriptions
>