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Not sure if this is a related issue. HP 850 G3 laptop with docking station, external VGA connected.
If the display blanks for more than an instant, the external display doesn't come back on until I undock and redock. This is OK:
$ xset dpms force off; xset dpms force on
This, on the other hand, leaves me with no external display:
$ xset dpms force off; sleep 0.1 ; xset dpms force on
Also possibly related or the same problem: if I dock with the VGA cable unplugged, and plug the VGA cable in, the external display is detected. Unplug, and it goes away. Plug it in for a second time and it's not detected again.... until I undock and redock, just like after a screen blank.
This persists after updating to 4.8.0-32-generic #34~16.04.1-Ubuntu