did you verify Mic Jack support Jack detection by
hda-jack-sense-test -a
seem digital mic
try record in stereo instead of mono , use audacity to find out whether
left and right are out of phase
Node 0x13 [Pin Complex] wcaps 0x400001: Stereo
Control: name="Internal Mic Phantom Jack", index=0, device=0
Pincap 0x00000020: IN
Pin Default 0x90a60040: [Fixed] Mic at Int N/A
Conn = Digital, Color = Unknown
DefAssociation = 0x4, Sequence = 0x0
Pin-ctls: 0x20: IN
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https://bugs.launchpad.net/bugs/1356393
Title:
[XPS M1330, SigmaTel STAC9228, Mic, Internal] volume too low and
distorted even with boost
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