Tao Jin tao-j

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tao-j / brt.m

Last active September 2, 2023 02:17

M1 External Monitor Brightness Control over DDC

	@import Darwin;
	@import Foundation;
	@import IOKit;

	// clang -fmodules -o brt brt.m && ./brt

	// credit to @zhuowei for discovering the following APIs
	typedef CFTypeRef IOAVServiceRef;
	extern IOAVServiceRef IOAVServiceCreate(CFAllocatorRef allocator);
	extern IOReturn IOAVServiceCopyEDID(IOAVServiceRef service, CFDataRef* x2);