I've had my MBP for a few weeks now and I've noticed that after leaving the computer idle for just a minute or maybe two the screen dims slightly. This happens whether I have the wall adapter plugged in or just run off the battery. I don't mind this happening when I'm running off the battery, but when the wall adapter is plugged in it kind of bugs. I went into the display settings and chose the "custom" option to specify times for screen savers, shutting of the display, etc., but the screen still dims. Is this something that just can't be changed or am I just not looking in the right spot? I'm still very much a mac newb.