Haven't seen this once since upgrading to 16.04 back in April, so I'm pretty sure the issue has been fixed. Yay!
** Changed in: xorg (Ubuntu) Status: Expired => Fix Released -- 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/1345573 Title: Horizontal lines flashing on screen briefly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1345573/+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