I see the same error message when I try the following:

* laptop is in docking station, external monitor is connected
* send laptop to sleep
* undock laptop
* wake laptop up

The error message is present on the terminal, my KDE session is logged out. 
Nothing useful in .xsession-errors though.
The laptop is a new T450s, running Kubuntu 15.10.

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https://bugs.launchpad.net/bugs/1488719

Title:
  dmesg shows "[drm:gen8_irq_handler [i915]] *ERROR* The master control
  interrupt lied (SDE)!"

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