Hi I have a 2.5 classic MBP and when I have my preferences set to "Automatically adjust brightness" the screen "pulsates". It looks like it adjusts the brightness up an down all the time. Thia only seems to happen in low light conditions. Any idea what causes this? EDIT: The light in the room is obviously constant. When I look at the System Pref window I can see the dot that you drag on the line to adjust the brightness pulsates as well!