Use LightDM for the Lock Screen
We should use LightDM for the lock so we have a consistent locked appearance/behavior and also to enable cool fancy stuff that the current lock screen doesn't support.
Main issue with using lightdm as a lockscreen is that you still actually need a locker (otherwise people can use ctrl+alt+f7 to get to their unlocked session). light-locker is a fork of gnome-screensav
What's missing there are scripts to lock the session on suspend and hibernate (with logind and policykit). Currently using light-locker breaks suspend/hibernate, because sending you to lightdm-greeter and locking conflicts with the system trying to go to sleep-mode.
Link to source: https:/