Hi Alex, thank you for your quick analysis. Now I can say the bug can be 
closed: The bug seems to be caused by hardware - obviously my kvm switch gets 
old and i need to replace this.
However, your hints are valuable regarding the versions. When I was new to 
Ubuntu, I had tried to install the graphics card, and then i did some manual 
work which was not absolutely standard. (probably i'll install ubuntu new again 
since that graphics is not that new anymore)
Thank you, Stefan

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https://bugs.launchpad.net/bugs/2143784

Title:
  Mouse lags at least since previous update (6.17.0-14-generic)

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