Public bug reported: This problem appeared immediately after my upgrade to ubuntu 18.04.
I have been running an external monitor in portrait mode and this worked fine until the upgrade to 18.04. In gnome-control-center >> Devices >> Displays, when I select Orientation = Portrait for the external monitor and then apply the change, the external monitor does not appear to receive a signal from the computer (the monitor goes into power-save mode). The external monitor works normally with the selection Orientation = Landscape. Description: Ubuntu 18.04 LTS Release: 18.04 ** Affects: unity (Ubuntu) Importance: Undecided Status: New ** Tags: dual-screen external landscape monitor multi-monitor orientation portrait -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1770435 Title: Portrait orientation not available for external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1770435/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs