Now I tried with the newest kernel 4.7.0-994-generic together with an 
Xorg.conf.d fix from
https://github.com/linuxenko/ubuntu-skylake-i915-video-fix

It now works almost flawlessly over DP 4K 60hz.

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https://bugs.launchpad.net/bugs/1597267

Title:
  ThinkPad X260 connecting external DisplayPort hangs system

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