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
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https://bugs.launchpad.net/bugs/1770435
Title:
Portrait orientation not available for external monitor
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