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How brightness change acer laptop without function key

Last response: in Windows 7
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March 3, 2013 4:36:02 AM

i have acer aspire4739Z lap.the fn+Arrow does not work to adjust screen brightness.is there any possible options to adjust brightness without function with arrow key?
a b D Laptop
a b $ Windows 7
March 3, 2013 7:29:56 PM

Control Panel > Power Options

Use the slider at the bottom of the window to adjust screen brightness.
March 4, 2013 12:32:08 PM

in my lap,there is no slider at the bottom of power option.
March 4, 2013 12:38:19 PM

in my lap,there is no slider at the bottom of power option.
what can i do?any other options possible to solve this problem?
!