I am using Ubuntu 16.04LTS and had a similar behavior. I have External Dell monitor and whenever I was visiting sites that has flash, or moving the windows my monitor was flickering like crazy. Setting the refresh rate to 60Hz made everything fine.
xrandr -s 1920x1080 -r 60.00 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/349943 Title: Screen blinks randomly on external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/349943/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
