How Can I Fix - adjustment of brightness not working on sony vaio?

adjustment of brightness not working on sony vaio

initially my laptop has brightness adjustment on vaio worked very well in windows 8 after few days i upated to 8.1 , then also intially worked but now brightness adjustment is not working at all 
my vaio model no:svf15318snb
please help me to solve this issue

Anwsers to the Problem adjustment of brightness not working on sony vaio

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Hi,
Just in case you would have missed those threads before posting:
http://answers.microsoft.com/en-us/windows/forum/windows8_1-hardware/sony-vaio-laptop-upgrade-to-windows-81-brightness/f915bf10-bb69-4246-95ee-46adf2bb41f7http://www.designstudioschool.com/vaio-windows-upgrade-brightness-issue-t253415.html
there are many others here and there on the Net...
Hope this helps
Cheers
Lz.

Open Action Center by clicking the Start button Picture of the Start button, clicking Control Panel, and then, under System and Security, clicking Review your computer's status.

Make sure your computer has at least the minimum amount of random access memory (RAM) required to run the program that is displaying the error. Look for the program requirements online or in the packaging information.

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