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
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https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1487168/+subscriptions
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