Curious you describe a setting that doesn't seem to exist:
"Confidentiality, Deactivating lock screen"
Do you mean this? Privacy > Screen lock = OFF
Regardless, please upload your system information using this command:
apport-collect 1724105
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1724105
Title:
Confidentiality : Deactivating lock screen doesn't work
Status in gnome-shell package in Ubuntu:
Incomplete
Bug description:
In System Settings, Confidentiality, Deactivating lock screen : does
not work after opening laptop lid.
Still presented by the GDM users/password lock screen.
Worst case : sometimes, presented by the screen saver window, hitting
space bar to reveal desktop cause a shell freeze.
Been like this also on Ubuntu Gnome 17.04
Dell XPS 13 (9360)
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