(Downside: The USB ports on your monitor will no longer be useable.) Boot back into Windows and the Bootcamp software will now be unable to reduce the brightness over USB. There are a few hacks:īoot into OSX, turn the brightness to your desired level, unplug the USB cable going into your monitor. If you're running a 64-bit version of Windows, then things get a little more complicated, as the WinACD driver is not compatible. If you're running a 32-bit version of Windows, simply install WinACD, which adds Apple Cinema Display controls to Windows Display Properties. My research has led to the following conclusions: This is a problem that was introduced by Apple in Bootcamp 2.1 and can be fixed in the following ways:
