Public bug reported:
Unfortunately display settings doesn't switch on display 3 voluntary and
even switches off display 1. Getting all three switched on is quite
often a longish juggeling act restarting the whole x-server and clicking
on "Use this display" over and over. Sometimes the screen then gets
switched on for 2-3 seconds and then immediately off again just to
repeat the whole mess.
Interestingly enough though, the Display-Lockmanager lightdm never has
any problems and starts on all three displays. Only once the xfce
desktop itself starts after the login, the display or displays get
switched off again and must painstakingly switched on again by the above
process.
Sometimes it is enough (luckly most often in the 2 display setup where
display 1 is missing) just to lock the screens and to log in again (a
few times) to get all displays working properly.
Once all three displays are switched on successfully I run the xrandr
command below which then in turn messes up the display-settings display
since it can't handle scaled displays, as visible from the attached
screenshot (but that is only a trivial issue compared to the main
problem)
xrandr --output VGA-0 --off --output DP-5 --off --output DP-6 --mode
3840x2160 --pos 6080x0 --rotate normal --output DP-4 --mode 3200x1800
--pos 0x0 --rotate normal --output DP-3 --scale 1.5x1.5 --mode
1920x1200 --pos 3200x0 --rotate normal --output DP-2 --off --output DP-1
--off --output DP-0 --off
The three displays are -left to right-
a 15,6" laptop display,
a 24" FullHD display (scaled 1.5x1.5) <- This is missing in the 2 display setup
and a 28" UHD display
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xfce4-settings 4.12.0-2ubuntu1
ProcVersionSignature: Ubuntu 4.3.0-6.17-generic 4.3.3
Uname: Linux 4.3.0-6-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.19.3-0ubuntu3
Architecture: amd64
CurrentDesktop: XFCE
Date: Sun Jan 17 14:48:43 2016
InstallationDate: Installed on 2014-05-30 (597 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
SourcePackage: xfce4-settings
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: xfce4-settings (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug wily xenial
** Attachment added: "display-settings_from_2016-01-17_14-03-49.png"
https://bugs.launchpad.net/bugs/1535078/+attachment/4551479/+files/display-settings_from_2016-01-17_14-03-49.png
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https://bugs.launchpad.net/bugs/1535078
Title:
xfce4-display-settings fails to configure 2 and 3 display setups
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