you need to find out which unconnectecd pin complex is the headset mic
need to recomplie driver
patch_via.c
patch_vt1802
spec->parser_flags = HDA_PINCFG_HEADSET_MIC;
try three unconnected pin complex which pincap support IN one by one
{ 0x??, 0x01a1913c }, /* use as headset mic, without its own jack
detect */
Noe 0x29 [Pin Complex] wcaps 0x400481: Stereo
Pincap 0x00002324: IN Detect
Vref caps: HIZ 50 100
Pin Default 0x50a701f0: [N/A] Mic at Int N/A
Conn = Analog, Color = Unknown
DefAssociation = 0xf, Sequence = 0x0
Misc = NO_PRESENCE
Pin-ctls: 0x00: VREF_HIZ
Unsolicited: tag=00, enabled=0
Power states: D0 D1 D2 D3 EPSS
Power: setting=D0, actual=D0
Node 0x2a [Pin Complex] wcaps 0x400481: Stereo
Pincap 0x00002324: IN Detect
Vref caps: HIZ 50 100
Pin Default 0x418130f0: [N/A] Line In at Ext Rear
Conn = 1/8, Color = Blue
DefAssociation = 0xf, Sequence = 0x0
Pin-ctls: 0x00: VREF_HIZ
Unsolicited: tag=00, enabled=0
Power states: D0 D1 D2 D3 EPSS
Power: setting=D0, actual=D0
Node 0x2b [Pin Complex] wcaps 0x400481: Stereo
Pincap 0x00002324: IN Detect
Vref caps: HIZ 50 100
Pin Default 0x41a190f0: [N/A] Mic at Ext Rear
Conn = 1/8, Color = Pink
DefAssociation = 0xf, Sequence = 0x0
Pin-ctls: 0x00: VREF_HIZ
Unsolicited: tag=00, enabled=0
Power states: D0 D1 D2 D3 EPSS
Power: setting=D0, actual=D0
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https://bugs.launchpad.net/bugs/1332233
Title:
[HDA-Intel - HDA Intel PCH, recording] Recording problem
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