I found out some rather interesting things playing around with the ALSAmixer, a 
friend just showed it to me:
I can controll the loudspeakers on the top and the TRS-audio-jack through 
"Headphone",
and the bottom ones through "PCM" (whatever that is).
This kind of solves the problem, though this should (somehow) be done automatic.

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https://bugs.launchpad.net/bugs/784738

Title:
  internal loudspeakers not switched off when pluging in headphones

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