I experience similar problem with gnome-mplayer on single computer with intel 
graphics and there is also a lot of DPMS logs.
According this bug
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1231857

xset dpms force on
xset dpms force on
xset dpms force on

causes screen flickers.

** Changed in: xmir
       Status: New => Confirmed

** Changed in: unity-system-compositor (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1238886

Title:
  Screen flickers black during video playback on Intel graphics in dual
  screen mode

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