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[Raymond <1487168@xxxxxxxxxxxxxxxxxx>]

only virtualbox debug log can provide debug info about why emulated ich
controller support multi channel


               case GLOB_CNT:
1470	                    /* Global Control */
1471	                    *pu32 = pThis->glob_cnt;
1472	                    LogFlowFunc(("glob_cnt -> %#x\n", *pu32));
1473	                    break;
1474	                case GLOB_STA:
1475	                    /* Global Status */
1476	                    *pu32 = pThis->glob_sta | GS_S0CR;
1477	                    LogFlowFunc(("glob_sta -> %#x\n", *pu32));
1478	                    break;



1600	                case GLOB_CNT:
1601	                    /* Global Control */
1602	                    if (u32 & GC_WR)
1603	                        ichac97WarmReset(pThis);
1604	                    if (u32 & GC_CR)
1605	                        ichac97ColdReset(pThis);
1606	                    if (!(u32 & (GC_WR | GC_CR)))
1607	                        pThis->glob_cnt = u32 & GC_VALID_MASK;
1608	                    LogFlowFunc(("glob_cnt <- %#x (glob_cnt %#x)\n", u32, pThis->glob_cnt));
1609	                    break;
1610	                case GLOB_STA:
1611	                    /* Global Status */
1612	                    pThis->glob_sta &= ~(u32 & GS_WCLEAR_MASK);
1613	                    pThis->glob_sta |= (u32 & ~(GS_WCLEAR_MASK | GS_RO_MASK)) & GS_VALID_MASK;
1614	                    LogFlowFunc(("glob_sta <- %#x (glob_sta %#x)\n", u32, pThis->glob_sta));
1615	                    break;


https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/pci/intel8x0.c

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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:
  Invalid
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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