this bug affects me too on an aspire 6935 with this cound device:
PCI 1b.0: 0403 Audio device
[Created at pci.318]
Unique ID: u1Nb.7j4rLmSb06C
SysFS ID: /devices/pci0000:00/0000:00:1b.0
SysFS BusID: 0000:00:1b.0
Hardware Class: sound
Model: "Intel 82801I (ICH9 Family) HD Audio Controller"
Vendor: pci 0x8086 "Intel Corporation"
Device: pci 0x293e "82801I (ICH9 Family) HD Audio Controller"
SubVendor: pci 0x1025 "Acer Incorporated [ALI]"
SubDevice: pci 0x0146
Revision: 0x03
Driver: "snd_hda_intel"
Driver Modules: "snd_hda_intel"
Memory Range: 0xdb300000-0xdb303fff (rw,non-prefetchable)
IRQ: 47 (1036 events)
Module Alias: "pci:v00008086d0000293Esv00001025sd00000146bc04sc03i00"
Driver Info #0:
Driver Status: snd_hda_intel is active
Driver Activation Cmd: "modprobe snd_hda_intel"
Config Status: cfg=new, avail=yes, need=no, active=unknown
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https://bugs.launchpad.net/bugs/941219
Title:
[Acer Aspire 8930TG] Speaker Sound does not mute when Headphones are
connected. Ubuntu 12.04 LTS. Missing Auto-Mute Mode in alsamixer.
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