@tjaalton Thank you, I followed https://wiki.ubuntu.com/Testing/EnableProposed 
to enable proposed and ran "sudo apt-get install linux-image-4.4.0-38-generic".
But after reboot I had a low screen resolution on my laptop and it did no 
longer recognize my 2nd screen at all (did not turn on, xrandr did not see it 
either). uname confirmed I was running 4.4.0-38
I uninstalled the kernel again and it is as before again.

Did I do it wrong?

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https://bugs.launchpad.net/bugs/1553503

Title:
  multi monitors - black flashes or black screen when the mouse cursor
  leaves a monitor

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