I'm using 13.04.3 LTS on a desktop machine. Whenever I lock the screen, the screen goes blank for a couple of seconds, but then shows the login screen again. It never actually switches off (the power-saving light never comes on).
gnome-screensaver appears to be running:
misha@misha-antec:~$ pidof gnome-screensaver 30126
Also, while the screen idle timeout is set to 1 minute, the screen never goes blank or switches off, even when idle for long periods of time.
How can I get my screen to switch off when locked? How can I get the monitor to switch off after it has been idle for some time?