Public bug reported:

The "Screensaver & Lock settings dialog" for the gnome screensaver is
misleading and is a security risk.

It allows you to specify whether or not the screen will be turned off
after a certain time, and it allows you to specify whether or not the
session will lock (and require a password) after a certain time. The
dialog presents these as indpeendent options, but in reality, the lock
will NEVER operate unless you also enable "Turn screen off ...".

The "Lock" option should be grayed out/disabled if "Turn screen off" is
not enabled.

Much better would be to change the code so that the two functions are
independent of each other. Surely it should be possible to lock the
session after a set time even if you don't have the screen set to turn
off.

As it stands, users can be fooled into thinking that their session will
lock after a set time when in reality that will not happen unless they
have also enabled "Turn screen off".

In addition, at present the Lock options for 30 secs, 1 minute, etc
actually represent the time delay AFTER the screen is turned off. So for
example if you set "Turn screen off" to 5 minutes and "Lock" to 2
minutes, the session will lock after 5+2 = 7 minutes.

** Affects: gnome-screensaver (Ubuntu)
     Importance: Undecided
         Status: New

** Information type changed from Private Security to Public

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https://bugs.launchpad.net/bugs/1247683

Title:
  Gnome-screensaver does not lock if "turn screen off" is disabled

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