I believe it's a kernel problem. There are several of these reports: https://bugs.launchpad.net/ubuntu/+bugs?field.tag=ice-lake-flicker
** Tags added: ice-lake-flicker ** Summary changed: - External 4k monitor periodically shows black screen + [Ice Lake] External 4k monitor periodically shows black screen ** Package changed: xorg (Ubuntu) => linux (Ubuntu) -- 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/1884001 Title: [Ice Lake] External 4k monitor periodically shows black screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1884001/+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
