Since fedora 19, the behaviour in gnome for the lock screen has been different. Now, when a user manually locks the screen with the keyboard shortcut or via the menu, the screenshield (sometimes) is shown animating down, then the monitor(s) are turned off. The previous behavior was to show the lock screen, then after a set amount of time (1-2 minutes) the screen would shut off. There are multiple issues with the new approach. 1. It is visually jarring for the user who has just locked the screen to then instantly turn it off. 2. Many monitors take multiple seconds to turn off and on again. If a user is stepping away for 1 min. 5 seconds of this time can be spent waiting for the monitors to turn back on. 3. it dilutes the metaphor of the shield as a blind coming down over the screen. If you are just going to turn the screen off, why even show the shade down animation at all?
I also see this problem, and it's useless the way it is. When i lock de screen, i just want the screen locked, not the monitors turned off.
This issue is also reported upstream: https://bugzilla.gnome.org/show_bug.cgi?id=710904
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