I found myself a solution: run 
alsamixer
in the terminal
there you can mute (press m ) the headphone. 
This is not a solution for a long time, but I think you cand handle the problem 
for a while.
Bye! and Good luck!

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https://bugs.launchpad.net/bugs/995684

Title:
  Switching problem between headphone speaker and microphone to laptop
  built in speakers and front mic

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