how to fix windows 8.1 brightness problem

I have successfully found the solution for the problems you guys are facing!
I too had the same problem before, as it is because of the lack of display drivers of your device!
Steps to fix the problem:-

1.Right click on the MY COMPUTER icon on the desktop.

2.Select the Manage option.

3.Now select the Device Manager from the left pane on the screen.

4.Select the Display Adapters pane from the list on the center of your screen.

5.It will show you the installed display driver on your system. Right click on the driver and select the option update drivers.

Once the drivers are updated to the required drivers for your system it will automatically enable your brighteness option and hotkeys on your keyboard.
Surely works!

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