it is because pulseaudio expect internal Michael phantom jack
Node 0x11 [Pin Complex] wcaps 0x400483: Stereo Amp-In
Control: name="Internal Mic Capture Volume", index=0, device=0
ControlAmp: chs=3, dir=In, idx=0, ofs=0
Amp-In caps: N/A
Amp-In vals: [0x00 0x00]
Pincap 0x00000024: IN Detect
Pin Default 0xd5a30160: [Both] Mic at Int Top
Conn = ATAPI, Color = Unknown
DefAssociation = 0x6, Sequence = 0x0
Misc = NO_PRESENCE
Pin-ctls: 0x20: IN
Unsolicited: tag=00, enabled=0
Power: setting=D0, actual=D0
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https://bugs.launchpad.net/bugs/1000245
Title:
[Vostro 3300, IDT 92HD81B1X5, Black Mic, Front]line-in problem
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