Public bug reported:
So what happens is light-locker switches the screen that was disabled in
xfce on and leaves it on after login.
To reproduce:
Desktop environment is Xfce (Xubuntu) with lightdm and light-locker.
1.) Attach an external display to a laptop and configure the DE to only use
external display. Laptop display will be powered off and only the external
display will be on.
2.) Now lock your screen using the Whisker Menu or wait until the
xfce4-power-manager locks it. Now both screens are powered off.
3.) Try to log in (hit any key on the keyboard or move the mouse). Now both
displays are switched on and the login prompt is displayed on both of the (with
the resolution of the bigger so looks strange on the built in display).
4.) After you are logged in the built in display that was powered off before
locking the screen is on (it does not display anything as it was disabled in
xfce). It is blank (black) but you can see that the backlight is on.
I'm not sure if light-locker shouldn't switch on the disabled screen and
respect DE display configuration or if xfce4-power-manager should take
care of shutting down the disabled display again after login.
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: light-locker (not installed)
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: GNOME
Date: Sun Nov 29 19:30:01 2015
SourcePackage: light-locker
UpgradeStatus: Upgraded to wily on 2015-10-22 (37 days ago)
** Affects: light-locker (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug wily
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https://bugs.launchpad.net/bugs/1520970
Title:
light-locker switches disabled screen on (when used with xfce)
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