Risidual Settings left from Gnome 2.32

I have upgraded to Gnome 3 as I find it more useful for my work. However, on my laptop there appears to be residual setting leftover causing chaos that I cannot change.
In my old configuration, the screen was set to dim after a certain amount of non-use, which could only be resolved by increasing brightness manually.
I wish to disable this, but it was a setting available in gnome-power-manager in Gnome 2.32, which is now missing in Gnome 3.0…
Any way to get back / change this setting?