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When unplugged my laptop (DARU1) reduces the backlight as it is supposed to do. I used to be able to control how much the backlight is reduced through
System > Preferences > Power management, but I don't have that option anymore. Is there something wrong in my computer, or that option was remved in Hardy?
It's been removed from System > Prefs > Power Mgt.
Go to gconf-editor...
Apps > gnome-power-manager > backlight
Double click the brightness-battery line and set the percentage.
Hi mate, tell me at which percentage did brightness will be perfect?
you are probably the only person who can decide what reduced back light you are happy with.
75% seems about right to me.