Having the same problem, but I'm using xorg.
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Screen unlocking without password
Status in gnome-screensaver package in Ubuntu:
My screen is unlocking without a password after being locked for an
unknown time period, like a lunch break or overnight. It is not
hibernating or suspending, just locked. If I lock it and immediately
unlock it forces me to use password as it should, otherwise about 40%
of the time it just unlocks to my full session as I left it before
locking. I lock by physically clicking the lock icon in the top right
of the screen. I've not tested by just walking away and waiting.
I originally posted here
issue-at-login?noredirect=1#comment1641885_1012420 if that helps.
Let me know other info you need to help find a fix. This is a major
security issue for me at my location.
DistroRelease: Ubuntu 17.10
Package: gnome-screensaver 3.6.1-7ubuntu6
ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13
Uname: Linux 4.13.0-36-generic x86_64
Date: Wed Mar 7 15:16:15 2018
org.gnome.desktop.session session-name 'ubuntu'
org.gnome.desktop.session idle-delay uint32 300
InstallationDate: Installed on 2018-03-01 (6 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
PATH=(custom, no user)
Title: Screen locking issue
UpgradeStatus: No upgrade log present (probably fresh install)
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