I have this issue too with 16.04. Laptop + HDMI external monitor. Intel Integrated Graphics. I do not have the 20-intel.conf file in my xorg.conf.d so cannot check whether changing the acceleration method solves the problem.
I have this issue too with 16.04. Laptop + HDMI external monitor. Intel Integrated Graphics.
I do not have the 20-intel.conf file in my xorg.conf.d so cannot check whether changing the acceleration method solves the problem.