My cocoa application needs to disable the display's setting for 'Automatically adjust brightness'. This is the checkbox that can be found in System Preferences -> Displays
While I have found some great resources on how to get/set the brightness level, I have yet to find anything to help me disable the automatic setting.
So far this is what I have tried and this is not working, perhaps I have something wrong in the code?
This is in Swift.
// get the light sensor service
let lightSensor: io_service_t = IOServiceGetMatchingService(kIOMasterPortDefault,
IOServiceMatching("AppleLMUController"))
// connect to the service
var port: io_connect_t = 0
IOServiceOpen(lightSensor, mach_task_self_, 0, &port)
// set the property to false to turn off light sensor
let offState: Bool = false
let result: kern_return_t = IOConnectSetCFProperty(lightSensor,
kIODisplayAmbientLightSensorKey,
offState)
// print the result
if result == kIOReturnSuccess { print("yay") }
else { print("boo") }
// disconnect from service
IOConnectRelease(lightSensor)
Of course my output is 'boo' since this is failing. Can someone point out what I'm doing wrong?
I have also attempted using the following but I am not sure what values the kIODisplayAmbientLightSensorKey property takes.
var offState: Float = 0.0
IODisplaySetFloatParameter(service, 0, kIODisplayAmbientLightSensorKey, offState)
Additionally, I have come across kIODisplayOptionDimDisable and kIODisplayOptionBacklight but I believe what I need is to do is disable the AmbientLightSensor?
