Screen brightness

[SeriyVolk]

I'm running FC6 on a Compaq V6000 series laptop with a geforce go video card. Gnome-power-manager doesn't seem to recognize my screen, so the brightness adjustment sliders are unavailable. I found workarounds for vaio and macbook users but none for me. I need a way to change the brightness from the command line and/or get gnome to talk to my screen. Any help?

Btw I know there should be fn keys that handle this too, but they scare me. When I hold down the fn key the screen changes to a solid color (green or red so far) and hangs.

Thanks.