B540P Display brightness not adjustable

Hello,
i have just bought the Lenovo B540P VDZ9EGE (i5, GT650M, Windows 8 64bit)) and i have a problem. I can not change the screen brightness, neither with touch on the button of the screen, nor in Windows 8. In Windows 8 it says: not available and I can not click on it. The screen brightness is always on the highest setting I think. It would be nice, if you could help me. Thank you very much. I apologize for my english.

hi BK86,
If you have the IdeaCentre™ B540p (3363) with the NVIDIA® GeForce® GT650M, can you try to :
1. Update the display driver to GeForce 314.07 DriverVersion 314.07 - WHQL from the nvidia website.
2. Run Windows Update to get the latest patch and bug fixes.
After doing the steps above, try to press the brightness Up or Down button on the LCD panel
Spoiler (Highlight to read)
Hope this helps.
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