Auto brightness doesn't go below a certain level

[MacMan988]

Hi, I have a late 2011 macbook pro with mountain lion installed. Auto brightness has been working well for me since I bought the mac. But today I re-installed mountain lion and now the auto brightness seems to be not going below a certain point somewhere a little below the middle in the brightness adjuster in the system preferences. But it suddenly climbs if I bring a bright light near it.

At the moment I my room is completely dark with all the lights off but still it doesn't fall below the mid-range.


Any ideas?

 

[Interstella5555]

using any kind of keyboard cover?

 

[MacMan988]

using any kind of keyboard cover?

No, I'm not using any covers.

 

[JennyC]

Since you're not getting very many posts (I hope more knowledgeable people chime in!), I did what I could and tried to research your problem. These are my findings:
Auto brightness is not working on MacBook Pro OS X Lion https://discussions.apple.com/thread/3221901?start=15&tstart=0

It's mentioned to try a PRAM reset, so here's how to do that
How do I reset the PRAM of my MacBook Pro in OSX Mountain Lion? https://discussions.apple.com/thread/4228204?start=0&tstart=0
OS X Mountain Lion: Reset your computer’s PRAM http://support.apple.com/kb/PH11243


Good luck!

 

[MacMan988]

Since you're not getting very many posts (I hope more knowledgeable people chime in!), I did what I could and tried to research your problem. These are my findings:
Auto brightness is not working on MacBook Pro OS X Lion https://discussions.apple.com/thread/3221901?start=15&tstart=0

It's mentioned to try a PRAM reset, so here's how to do that
How do I reset the PRAM of my MacBook Pro in OSX Mountain Lion? https://discussions.apple.com/thread/4228204?start=0&tstart=0
OS X Mountain Lion: Reset your computer’s PRAM http://support.apple.com/kb/PH11243


Good luck!

Thanks for the information.