According to JournalErrors.txt you're using the nouveau X driver. So reassigning...
** Package changed: xorg (Ubuntu) => xserver-xorg-video-nouveau (Ubuntu) ** Tags added: nouveau -- 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/1774265 Title: Heavy flicker/flashing on external monitors using resolutions higher than 1920x1080 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1774265/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
