Thanks for the bug report. Issues like this are almost always caused by a bad cable, bad connection, or by using intermediate adapters. So ideally please try a new cable.
Also, next time the problem happens please then run: journalctl -b0 > journal.txt and attach the resulting text file here. ** Package changed: xorg (Ubuntu) => linux (Ubuntu) ** Changed in: linux (Ubuntu) Status: New => Incomplete -- 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/1929209 Title: external monitor goes black for several seconds at a time, randomly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1929209/+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