After fiddling around with "hdajackretask" i managed to map the pin 0x18
(in my case) to a speaker output and its visible now in the sound
manager.

# hdajacksensetest -c1 -a (diff. when plugging / unplugging audio cable.
It should show up a pin that is in use when plugged in. in my case
"0x18".

# hdajackretask

Select the pin # you found out earlier using "hdajacksensetest" (0x18 in
my case)

Select "Show unconnected pins" and "Advanced options". Configure as
follows:

Connectivity: Jack
Color: Green
Location: Dock
Jack Detection: Present
Device: Line Out
Channel Group: 1
Channel (in group): 30 & 31
Jack: 3.5mm

Hit apply now and test.
Hit install override if you want to make it permanent.

If you found this using google, keep in mind its just a workaround :)

Hope this helps someone!

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https://bugs.launchpad.net/bugs/1470730

Title:
  [HP EliteBook 840 G2, Realtek ALC3228, HP UltraSlim Dock 2013] Line
  in/Line out on docking station doesn't work

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