Brightness automatically diming

hunterjoules

macrumors member
Original poster
Jan 2, 2007
47
0
Hi everyone,

I have an Intel iMac, and for some reason every once in a while after I boot my machine the screen's brightness is very low, much lower than what I usually keep it at.

When this happens, I simply open the display preferences and increase the brightness to the appropriate level, but it is a little annoying. Most of the time my screen remembers it's brightness settings when I turn it on and off.

Does anyone know why this is happening? Is there anyway to "fix" this?
 

iBlue

macrumors Core
Mar 17, 2005
19,182
15
London, England
Could it be the ambient light sensor?

go into system prefs > displays > uncheck "automatically adjust brightness as ambient light changes"