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Fn + F5 + F6 are not responding to decrease and increase in brightness.

HP Recommended
Hp probook 640 G2
Microsoft Windows 10 (64-bit)

When i press the key Fn + F5 + F6 will not respond to either increase or decrease in brightness on my HP probook 640 G2. 


What can I do to make it work? Pls help me.

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