Bightness control no longer working
Some time ago I've sent my Cinema Display to repair under warranty. But after that, the brightness control of the display is missing from the display settings.
I think they may have forgotten to connect something inside the display. So, I'd like to know which connections I should check for it.
Note: the USB cable of the display is properly connected to the computer and the audio is working fine. The video is also working fine, but only with full brightness.