I suspect the input jacks are incosistently labeled. Can you try
changing the file /usr/share/pulseaudio/alsa-mixer/paths/analog-input-
dock-mic.conf
From:
[Jack_InputDevice]
code = Microphone
name = Dock
To:
[Jack_InputDevice]
code = Microphone
name =at Sep
(notice the space between "at" and "Sep")
Then reboot and see if that helps? Thanks!
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/859704
Title:
[Latitude E6420, IDT 92HD90BXX, Black Line Out, Left, Docking station]
Jack sensing doesn't work
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