Apple LED 27" Display and Pascal card

[sergeydgr8]

I currently have a GTX 1070 FTW in my machine powering three monitors, one of which is an Apple 27" LED display. I plugged in the mini DisplayPort cable and the USB cable into my machine, so I do have sound, iSight, and microphone working just fine, however I cannot get any brightness adjustment setting whatsoever on this monitor. I also tried plugging in an Apple keyboard and using the controls there, but it does not work.

I looked around, and all the fixes were to just plug in the cable, or use some util in Windows to fix it, however I already do have the cable plugged in, and I don't want to boot into Windows to adjust the screen brightness. Is there a util for Hackintoshes with Pascal cards that lets me adjust the brightness?

 

[sergeydgr8]

also, FWIW, here's from the system information:

LED Cinema Display:
Display Type: LCD
Resolution: 2560 x 1440
Pixel Depth: 32-Bit Color (ARGB8888)
Display Serial Number: XXXXXXXXXXX
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Automatically Adjust Brightness: No
Connection Type: DisplayPort