Macbook Pro Screen Backlight

Turn off "automatically adjust brightness" in System Preferences > Display.

I had the same issue after the 10.6.8 update. I reset my PRAM (hold Command-Option-P-R at bootup until it reboots, hold for 2-3 cycles is the legend) and it corrected itself. However, after a reboot, it was back. Cleared the PRAM again and won't reboot until the next OS update. I hope that helps.

Same issue after updating 10.6.8

This seems like it's doing it based on the sensor.

Try covering it up with your hand & see if it re-acts. Also try a flashlight.

Sorry you're having the issue. Here's a suggestion:

If your preferences aren't set to auto adjust the brightness and you've tried the PRAM reset and even reset the SMC (see http://support.apple.com/kb/HT3964) and used the flashlight, yet the problem persists, try creating a new user to see whether or not the same thing happens.

If it doesn't happen in the other account then it could be some user-specific configuration in the software that is causing the problem. If it does, however, I'd say back up your stuff and talk to the folks at Apple to make sure you don't have either a possible problem with a video cable or perhaps the display itself (hard to say at this point). They should be able to diagnose the root cause of the issue.

Type into terminal:

pmset -g

And post results.

I am glad to know I am not the only one having this problem. I turn the brightness level off on my computer so I can sleep at night and it keeps brightening itself back up. Very frustrating. I turned off automatic brightness of the screen and it didn't solve the problem either.

I have a mid-2010 15 inch and I recently updated software and it began happening. Other possibilities: I recently plugged a mini-display port to HDMI adapter into my computer, utilizing the port for the first time, but it's no longer plugged in. I also utilize Time Machine with an external hard drive and tried unplugging that with no results.

Please someone figure it out...

Have you tried repairing permissions? I just read somewhere else that worked for someone...

Hey there,

I can verify this issue. The same thing is happening to me.

2.53 GHz 15" 2010 MBP, 4GB RAM, Snow Leopard 10.6.8.

I leave my laptop on and open sometimes at night so I can finish downloading something, and since I upgraded to 10.6.8 the computer periodically turns the brightness up from 0-1 notch.

I'm repairing permissions now, and I will let you know what happens (it will take a while) but I have a feeling that it won't help.

Thanks for the help everyone.

The same thing is happening to my macbook pro 10.6.8

Can someone please find a solution to fixing this problem? Thank youuu