Brightness shortcut keys not working in Windows 8 or 8.1

I'm no longer able to use the brightness shortcut keys after I've installed the Lenovo power management tool in Windows 8 on a Ideapad U300s.
When the Lenovo power management tool is NOT installed on the system, pressing the shortcut keys brings up the Windows UI in the upper left hand corner of the screen and the display bridghness is adjusted accordingly.  
However, as soon as the Lenov PM software is installed, the Windows brightness indicator shows up ONCE and I can no longer adjust the brightness with the shortcut buttons.

Welcome to the Apple Support Communities
At the moment, there aren't any Boot Camp drivers ready for Windows 8, so it's normal that you have problems. Wait until Apple updates Boot Camp drivers, normally with a OS X update

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