Comment 0 for bug 1325353

In a university computer lab session we disable shutdown, restart, suspend, hibernate, switch user, and lock screen.
Some are done with polkit (suspend, hibernate) and then the suspend menuitem is not shown on the session menu.
Some are done with dconf e.g.

# Show real name (and wider session menu as a result); lab also disable shutdown
[com.canonical.indicator.session]
show-real-name-on-panel=true
suppress-logout-restart-shutdown=true
suppress-restart-menuitem=true
suppress-shutdown-menuitem=true
user-show-menu=false

# Quiet login screens
[com.canonical.unity-greeter]
play-ready-sound=false

# Update-notifier
[com.ubuntu.update-notifier]
no-show-notifications=true

# Software installation not possible for normal users
[desktop.gnome.unity.lenses.applications]
display-available-apps=false

# Disable the lock screen & print-setup not on laptops, but in labs
[org.gnome.desktop.lockdown]
disable-lock-screen=true
disable-print-setup=true
disable-user-switching=true

# Screensaver lockdown in labs
[org.gnome.desktop.screensaver]
lock-enabled=false
user-switch-enabled=false

# Logout prompt
[org.gnome.SessionManager]
logout-prompt=false

This works fine except there is no value for suppress-lock-menuitem or suppress-switch-menuitem or suppress-lock-switch-menuitem, and the Lock/Switch User menuitem still appears; even though it is non-functional. Clicking on it blacks out the screen for a second and then shows the desktop again.