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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.

  • When you upgraded to 16.04, did you actually do an upgrade from within 15.10, or a fresh install with a 16.04 ISO file? The reason I ask is that if you did an upgrade, it's possible that a fresh install of 16.04 would work better. In any case, I wouldn't recommend going back to 15.10, because it will stop receiving security updates next month. – Nick Weinberg Jun 23 '16 at 20:20
  • I did an upgrade from within 15.10... I' d rather live without security updates for a while than with flickering screen :) – user124147 Jun 23 '16 at 20:24
  • Strange that it never happens when running video in VLC or SMplayer, even if it this full hd. – user124147 Jun 23 '16 at 20:51
  • Does it only happen with Flash-based videos, or all videos in a web browser? – Nick Weinberg Jun 23 '16 at 20:56
  • Hmm I have tested it now and it seems to be flash related. But strange is that it also always happen when I open unity dash - everytime. Really confusing... – user124147 Jun 23 '16 at 21:10
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Finally, only the solution I found was revert back to older kernel 4.2.xxxx. All the newer kernels I have tried are causing abovementioned troubles for me.

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