I am running dual monitor setup (in mirror mode) on ubuntu. Right after upgrade to 16.04, I am experiencing issues with flickering (image on/off) on second screen (which is LGD LED TV), specifically when playing full screen video in browser (no matter if Chrome or Firefox). Every other minute this happens even if no video is playing, but once video is played, it happens every few seconds. I supposed it could be because of cable, so I have tried antother, but issue persists. Since this started right after upgrade to 16.04, I think it could be software or driver issue. It happens also when only TV is connected to PC. Please do you have any tips what to try, I am unable to get it working. Maybe I should somehow downgrade back to 54.10? My video chip is Intel HD Graphics 2500.