Bizaare problem: Cant control brightness only on wake from sleep from 27 Apple Cinema Displays

[Wolfie81]

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?

 

[Wolfie81]

Anyone?

Its really strange that Ive had this setup working perfectly before without issues or workarounds.

 

[Wolfie81]

bump...

I cant believe Im the only one with the brightness being locked upon wake.

 

[Wolfie81]

Hi there, my Hack works with controlling brightness via keyboard on fresh boot, but once it wakes from sleep, I cant control it (brightness is fixed) from either the keyboard or the slider in settings (it slides but makes no difference).

Sig is below. surely others have this issue?

 

[rwebb]

Hi there, my Hack works with controlling brightness via keyboard on fresh boot, but once it wakes from sleep, I cant control it (brightness is fixed) from either the keyboard or the slider in settings (it slides but makes no difference).

Sig is below. surely others have this issue?

I just noticed the same problem. Brightness control can be restored by restarting corebrightnessd using Activity Monitor or from the terminal with the command: sudo killall corebrightnessd

I'm researching a way to reset it at wake. I'll let you know when I figure it out.