Cristian - does 'xset dpms force off' switch the backlight off?
If so try switching the gnome screensaver to 1h and in power management set 
turning off the screen in 5min or some other value less than 1h. On my machine 
the screensaver blanked the screen with backlight on and didn't allow gnome 
power manager turn it off.

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[i815] Switching to DPMS off doesn't switch laptop's LCD backlight off
https://bugs.launchpad.net/bugs/409037
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