I have Ubuntu Studio 17.10 which comes with XFCE and LightDM preinstalled. I decided to install Gnome 3 but did not want to use GDM as I prefer LightDM.
My problem is that now when I use my Gnome session it wont black the screen after a while or lock out to the LightDM login screen, it just stays showing my Gnome desktop constantly. I have attempted to change this in Gnome Settings as well as in the LightDM GTK+ Greeter Settings but to no avail. I even set it to black screen/lock after 1 minute just to test it and nothing would work.
Here are the version numbers for the installed software:
Ubuntu Studio 17.10
Gnome Shell 3.26.1
LightDM 1.24.0
As requested here is an image of my Power settings, as well as an image of the LightDM settings.
Hopefully this is an easy fix, thanks in advance.
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