W540 - Windows 8 64bit - Fn-Keys not working

Dear Community
I have a brand new W540 with Windows 8.1 running. Some Fn-Keys are working, for example Fn+F2 for the volume. But I have some keys which are not working: Fn+F5 or Fn+F6 should change the LCD brightness.
Do you know why these keys are not working? All updates are applied (Lenovo and Windows)
Regards, Martin
Solved!
Go to Solution.

Can you change brightness in the Power control panel?
1.  from the start screen, type "Power Options"
2.  click on Power Options
3.  At the bottom of this window, should be a slider control to change the screen brightness.  Is it there?  Does it work?
See this image for reference

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