it is unlikely front Mic is selected automatically
there are four capture source
control.21 {
iface MIXER
name 'Capture Source'
value Line
comment {
access 'read write'
type ENUMERATED
count 1
item.0 'Rear Mic'
item.1 'Front Mic'
item.2 Line
item.3 CD
}
}
although support Jack detection but does not support unsolicited event
it is using a timer to monitor the state of headphone jack when the playback
device is open
Node 0x21 [Pin Complex] wcaps 0x400101: Stereo
Control: name="Front Mic Jack", index=0, device=0
Pincap 0x00000334: IN OUT Detect
Vref caps: HIZ 50
Pin Default 0x02a190f0: [Jack] Mic at Ext Front
Conn = 1/8, Color = Pink
DefAssociation = 0xf, Sequence = 0x0
Pin-ctls: 0x21: IN VREF_50
Connection: 1
0x1b
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https://bugs.launchpad.net/bugs/1322374
Title:
[M660SRU, VIA VT1708, Pink Mic, Front] No autoswitch
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