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I'm using Arch Linux with Gnome as DE and lightdm as display manager.
I have a keyboard shortcut with the xset dpms force off command for turning off the laptop monitor. When I execute this command display goes off but when I press any key it turns up to the lightdm login screen.
I just want to turn off the screen not log out from the desktop.
LightDM locking is controlled by the light-locker. Starting it with option --no-lock-on-suspend and then issuing command xset dpms force suspend should turn off the screen without locking the session.
dmsgoutput, right after logging back in? It would also be helpful to tell us, which resources you already know. This page, for example: wiki.archlinux.org/index.php/Display_Power_Management_Signalingxset dpms force standbyorxset dpms force suspend, instead ofxset dpms force off? And did you try prependingsleep 1as mentioned on the page?