Similar issues on my Dell M4800.
Even worse for me is a serious security issue: sometimes, when laptop suspends 
at login screen and I hit power button on docking station to wake up from 
suspend, I see my Desktop without ever having to enter a username and password. 
This is obviously a serious problem.

  for d in /dev/input/event*; do if ! sudo evtest --query $d EV_SW SW_DOCK; 
then echo $d; fi; done
returns nothing.

Journal.txt and monitors.txt attached

** Attachment added: "monitors.txt"
   
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1450009/+attachment/4781644/+files/monitors.txt

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https://bugs.launchpad.net/bugs/1450009

Title:
  [HP, Dell notebooks] suspends on closed lid, does not recognized
  external monitors/dock

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