Public bug reported:
I've enabled fractional scaling and set my laptop's 3840x2160 screen to
175% scaling. Upon plugging in an external 1920x1080 monitor, my
laptop's screen resets to 200% scaling, and the external screen is set
to 100%, to the right of my laptop's screen.
If I try to set the laptop screen back to 175%, the Displays panel does
not allow me to Apply, and journalctl outputs: Config not applicable:
GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: Logical monitors not
adjecent
Putting the external screen on the left or top of the laptop screen
allows Apply to work (bottom or right does not work), but immediately
reverts to the auto-set settings (200% laptop with 100% external on the
right) and then clicking "revert" on the "revert or keep" dialog sets
things to the requested scale factor and position (175% laptop with 100%
external on the top/left).
That's a bit long winded, so here's a shorter rundown of bugs description:
1) Upon connecting an external screen, the laptop screen scaling changes
2) Can't set external screen to the bottom or right of laptop screen with
fractional scaling
3) Upon Application, the requested settings are reverted, and then reverting
the reversion applies them, while "keeping" the change reverts
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: mutter 3.30.0-4
ProcVersionSignature: Ubuntu 4.18.0-7.8-generic 4.18.5
Uname: Linux 4.18.0-7-generic x86_64
ApportVersion: 2.20.10-0ubuntu11
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed Oct 3 15:17:03 2018
InstallationDate: Installed on 2018-09-26 (7 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: mutter
UpgradeStatus: Upgraded to cosmic on 2018-09-28 (5 days ago)
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug cosmic wayland-session
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https://bugs.launchpad.net/bugs/1795991
Title:
Difficulty setting up multimonitor with fractional scaling
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