Same here. Before I was using Xubuntu 12.04 LTS, everything was OK.
Installed Xubuntu 16.04 from scratch and problem started - external
display (HDMI cable connected to Thinkpad X220's display port via cable
adapter) goes dark for a split second randomly. I have noticed this
happens mostly, if not even only, when I watch a video on that screen.
It can be a movie opened with VLC in fullscreen mode or youtube video in
the browser's window. Interesting fact - it happens even if the video is
paused. I highly doubt this is a hardware issue as it worked properly on
12.04 and on Windows 10. I also do not believe this to be related to
faulty electric equipment at home as the whole setup is connected to an
UPS so I hope whatever power fluctuations are there, get filtered out.
Keeping mouse pointer either on main laptop screen or on external
display, or moving fast between them does not make any difference.
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https://bugs.launchpad.net/bugs/1574617
Title:
External monitor keeps going blank
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