Same issue here on a Dell Latitude E5470.

OS: Ubuntu 16.10
Kernel: 4.8.0-22-generic
CPU: Intel(R) Core(TM) i7-6600U CPU @ 2.60GHz
GPU: Intel Corporation HD Graphics 520 (rev 07)
Xorg (package version): 1:7.7+13ubuntu4 

Also it's very intermittent, hard to forcefully reproduce. I was doing a
test with Xenial on the same laptop earlier today and it never happened.

Also, may be related, may not be: When I first turned off mirror screens
so I had the second screen, I ended up with a flickering, messed up
background.   To get rid of it, I had to full screen something.

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https://bugs.launchpad.net/bugs/1634449

Title:
  Black flicker when leaving monitor

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