I just downloaded OS X Mavericks for my MacBook Pro. I don't know if this is a unique problem, but the screen brightness is automatically adjusting on it's own.
If I set it for about half the bars (50%), I'll be working, then notice that the screen is brighter than normal. I'll check and it'll be at 75% or higher. Then, when I open the MacBook from sleep, sometimes the brightness is at 100% and sometimes it'll be 10%.
What gives? Is there a automatic adjust brightness setting on the new OS that I need to turn off?
Best Answer
There is an automatic brightness adjustment setting, but it's not new to Mavericks. In System Preferences, check Displays; the setting is called "Automatically adjust brightness".
It adjusts based on a light sensor near your MacBook's built-in camera. I've found it to be fairly good, but occasionally tipping my MacBook Air's display back a little further back than usual will make the light sensor detect more light and brightens the display considerably.