Lock your laptop and turn off display with the touch of a keystroke in Ubuntu Karmic
I think this feature will soon be standard in Ubuntu as many users requested it. It's absolutely mandatory for me because every time I leave my laptop I carry out this action, even at home. Yeah, call me paranoid...
I've written a simple script to deal with the issue:
#!/bin/bash
gnome-screensaver-command -l
sleep 3
xset -display :0.0 dpms force off
You're encouraged to bind it to any key combo. It should work perfectly out of the box but a gnome-power-manager related bug enables the display some seconds or minutes later randomly, so we have to
killall gnome-power-manager
and it should be pretty fine. For those who can't afford to live without gnome-power-manager an alternative (and in my opinion suboptimal) workaround exists.