Ahmedgs

Q: Screen brightness is changing, strange!

Hello everyone,

 

I recently go a mac air 13 inch. I the past few days while using the laptop, I'm feeling the screen brightness is changing, mostly decreasing. The value indicated by the level (that you can change from the keyboard keys) is constant, but I feel the screen brightness is changing.

Did this happen to any one else?

 

Thanks.

MacBook Air, OS X Mountain Lion (10.8.1)

Posted on Sep 4, 2012 12:29 PM

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Q: Screen brightness is changing, strange!

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  • by captfred,Solvedanswer

    captfred captfred Sep 4, 2012 12:43 PM in response to Ahmedgs
    Level 7 (26,329 points)
    iTunes
    Sep 4, 2012 12:43 PM in response to Ahmedgs

    A couple of items can change the display brightness.

     

    System Preferences > Energy Saver > Battery tab > Slightly dim the display while on battery power.

     

    System Preferences > Displays > Display tab > Automatically adjust brightness

  • by Ahmedgs,

    Ahmedgs Ahmedgs Sep 5, 2012 1:06 PM in response to captfred
    Level 1 (1 points)
    Sep 5, 2012 1:06 PM in response to captfred

    Hi Captfred,

     

    I think that was the source of brighness varation, the " Automatically adjust brightness".

     

    Many thanks for your help.

     

    Bye

  • by SoCalGadgetGuy,

    SoCalGadgetGuy SoCalGadgetGuy Jan 11, 2013 1:34 PM in response to Ahmedgs
    Level 1 (1 points)
    Jan 11, 2013 1:34 PM in response to Ahmedgs

    I had this problem with my Macbook Pro 15" and the cause turned out to be a faulty power connector, the classic defect of the cable end starting to separate from the housing that clings to the Mac. I have a couple of adapters and was using an old MagSafe supply with the straight connector.

     

    This issue was driving me nuts. When viewing the Displays control in System Preferences, even moving the Brightness slider to the full right position and unchecking the option to "Automatically adjust brightness" I watched the Brightness slider automatically do a slow, random "bounce" between the full position and a level about 20% less. It kept randomly gliding between the two levels. At first I thought something must be wrong with my hardware, like the light sensor was messed up and somehow still controlling things, or that the trackpad or keyboard was stuck. But it still happened even when the preference pane was closed. Virus? No! I then noticed the LED indicator going on and off on the MagSafe connector in sync with the shifting display levels. Thank goodness for that second setting  tucked in Energy Saver on the Battery tab to "Slightly dim the display while on battery power" and the LED or I would not have noticed my battery discharging when I thought it was on AC power.

     

    For now I wrapped some tape around the end where the cable enters the MagSafe housing, problem solved.

  • by Vitalii Zab,

    Vitalii Zab Vitalii Zab Jul 16, 2015 10:41 AM in response to SoCalGadgetGuy
    Level 1 (0 points)
    Jul 16, 2015 10:41 AM in response to SoCalGadgetGuy

    This post extremely helps me, it was a bad socket)

  • by DisneyAlex,

    DisneyAlex DisneyAlex Sep 20, 2016 4:46 PM in response to Ahmedgs
    Level 1 (4 points)
    Sep 20, 2016 4:46 PM in response to Ahmedgs

    Hi Captfred,

    As already mention.

    I think that was the source of brighness varation, the " Automatically adjust brightness".

     

    Many thanks for your help.
    From Alex in Stockholm