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10.6.8 update: screen brightness issues when hooked to external monitor

I just upgraded to MacOS 10.6.8 yesterday, and since then, the screen on my Macbook is acting strange.

I'm hooked up to an external monitor which I use almost all the time as the primary monitor. Usually, when I'm using the external, I turn the brightness all the way down (to black) on the Macbook. After the update, however, the Macbook seems to have a mind of its own. The screen gets brighter, then dimmer, then brighter again, without reason. Or, othertimes, after about 30 seconds of inactivity, the Macbook screen gets brighter, then when you move the mouse, it goes back to black again.

It's not that I care so much, but just wish I knew what was going on. Glitch in the new software?

Macbook

MacOS 10.6.8

External monitor: ViewSonic VA2231wm

MacBook

Posted on Jun 25, 2011 10:38 AM

32 replies

Jan 11, 2013 3:27 PM in response to ploebs

I am using my macbook 10.6.8 with latest updates with external monitor. Have same issue.. but there is easy step. Open System preferences>Display and Uncheck Automatically adjust brightness as ambient light changes.

Hope this help for you 🙂

May 24, 2016 7:16 AM in response to ploebs

SOLUTION: System Preferences>Energy Saver>Battery>UNCHECK Automatically reduce brightness before display goes to sleep

Do the same with Power Adapter

10.6.8 update: screen brightness issues when hooked to external monitor