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How to bring brightness control slider back in display Preferences if its missing?

2226 Views 7 Replies Latest reply: May 1, 2012 12:53 AM by sunny_1991 RSS
sunny_1991 Level 1 Level 1 (15 points)
Currently Being Moderated
Apr 29, 2012 9:06 AM

Hi,

     I am using MacBook Pro(Mid 2010) 15". I have Mac OS X Lion(10.7.3). Before a week i was able to control brightness of my LCD display (i.e., 15" screen, not any other external Monitor) through Brightness keys from Keyboard, but it stopped working before 5-6 days. Then i tried to restart my laptop many times, nut it didn't helped. After a while i search through many discussion and forums over internet for finding my solution but it didn't help. Then i read somewhere that use slider control in display preferences. So, i went to display preferences, then i saw that there is no slider control in display preferences. Now i don't know what to do. So plz guys help me if you know any solution to this problem.

 

     I have attached the image of my Display Preferences for getting you an idea what i am saying. And i Think if the slider comes back then keyboard keys will also get working automatically.

 

Screen Shot 2012-04-29 at 9.32.36 PM.png

MacBook Pro, Mac OS X (10.7)

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