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Can someone tell me how to enable the shortcut keys for brightness (Fn+Up or down arrow key) in Windows 8? I am using a Lenovo G580.

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They should be enabled by default, you can’t actually disable them. They should be handled by the hardware and independent of the software. Check the Power Options Control Panel applet to see if you are even able adjust the brightness manually through software using the control at the bottom. –  Synetech Aug 31 '13 at 2:19
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