04-11-2009, 04:08 PM
Here's what I've concluded about that situation on my MBP.
There are light sensors near the perforated vents on the top/sides. If you cover these vents with your hands, the screen will dim.
Chances are, you are passing your hand over one of the sensors beneath the screens, thus dimming the screen in response.
Set a desk light so it shines onto one of the screens. This will keep the LCD bright.
Or go to System Preferences / Displays and uncheck "Automatically adjust brightness as ambient light changes." Then you must manually adjust screen brightness with F1 and F2 if you move to a brighter or dimmer room.
There are light sensors near the perforated vents on the top/sides. If you cover these vents with your hands, the screen will dim.
Chances are, you are passing your hand over one of the sensors beneath the screens, thus dimming the screen in response.
Set a desk light so it shines onto one of the screens. This will keep the LCD bright.
Or go to System Preferences / Displays and uncheck "Automatically adjust brightness as ambient light changes." Then you must manually adjust screen brightness with F1 and F2 if you move to a brighter or dimmer room.