Take the 2-minute tour ×
Ask Different is a question and answer site for power users of Apple hardware and software. It's 100% free, no registration required.

When I set my brightness on a 27'' iMac (2011) next time it boots up, it's dimmed. I switched off the ambient sensor, so this shouldn't be the problem. The connected Cinema Display remembers the brightness correctly.

Had anyone the same problem and found a solution?

share|improve this question
    
What version of OS X are you running, and which brightness level do you have it set on? –  l'L'l Oct 9 '11 at 18:32
    
Snow Leopard with all updates applied. For testing purposes I have tried to set it to maximum, but it returns to three or four ( I must reboot to look for the exact level ) –  Sascha Oct 9 '11 at 19:34
    
The exact level it reverts to is three. If I remove the two Cinema Displays attached, it reverts to six. The Cinema Displays aren't affected by this behavior. –  Sascha Oct 9 '11 at 19:40
    
Try setting it one or two levels below maximum and restart. I know that people have said if it's set to the max or min level that can happen. If you still have the same result there's a couple more things you can try. I could make a tiny script that will automatically boost it up where you want it whenever you restart, etc. if you run out of possible possibilities. –  l'L'l Oct 10 '11 at 0:23
    
Tried to set it to a value lower than max and rebooted. Reverted back. I'm going to test that tomorrow with the Cinemadisplays disconnected. –  Sascha Oct 10 '11 at 20:05
show 2 more comments

1 Answer

I have heard a few people complain of brightness resetting on reboot. Traditionally brightness settings are stored in the PRAM, which you can reset via PR on booting. I would be interested to see if it gets "stuck" on a brightness setting that you do not wish to have after resetting the PRAM.

share|improve this answer
    
Does not changed the behavior. Rebooted and hold down the key combination ( it rebooted again ). Then set my desired brightness, rebooted and the same problem again. –  Sascha Oct 9 '11 at 14:56
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.