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Brightness not working on hackintosh (desktop, not laptop)

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1080ti FTW3
Mac
  1. iMac
Hi guys,

Cant work out whats going on. In all my years of hackintosh, haven't had this issue until now (was even stable until the last point update).

I have 2x Apple 27inch Cinema Displays hooked up to my PC. I use the Apple bluetooth keyboard without issue.

On fresh boot, brightness keys control the monitor brightness no problem. On wake from sleep, I either get no movement of the bars for brightness on the screen (it just shows as a circle) or I get my near full brightness with the level but it is fixed in that one position on the screen.

These monitors are the Cinema displays, not thunderbolt, thus powered by USB. I dont see it as a USB issue as the keyboard works fine for everything else. It seems to be a software glitch but I dont know how for where to look

Any ideas?
 
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