Win8.1, T540p - brightness buttons are not working

Hi all!
I have a new T540p with Windows 8.1 and fn+f5/f6 do nothing, while sound buttons work fine. Is there any way to change screen backlight brightness, coz it too birght for me by default.
Solved!
Go to Solution.

Just installed Hotkey Features Integration Package and it works now. Topic can be closed

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