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
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
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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