It is annoying. I sit on my MacBook and get closer and closer to the screen so I can see something – and all because my screen seems to get darker and darker. I never had this but then I usually work on the big Cinema Display. Oh well. It was really nasty and it took me a while to realize it and then figure it out. I have no idea how this setting appeared or if it is set by default but whatever the reason is – I thought I let you know how to fix this easily.
Keep your display bright
Go to your Applications Folder -> open the system preferences, -> click on “Displays”. Then make sure that you have chosen the tab “Display” and not “Color”.
Now turn of the box “automatically adjust brightness” – and you are rid of the problem 🙂