Problem with brightness control of Apple 27" Cinema Display under Windows PC
 

Hello, I use the newest USB3.0 to DP adapter capable of 3840x2160.
I am connecting a Windows PC to an Apple 27" Cinema Display as following:
Win7 64bit USB3.0 -> Displaylink -> Displayport-to-Mini-Displayport-Adaptor -> Apple Cinema Display.
Now the problem is I cant find the way to control the brightness of the displayer directly. Is there a software updating or other solutions?
Regards,
Zerox

I solved it !