Despite this, few OSes offer DDC-based control of features such as brightness which is where developed a popular utility for MacOS that used undocumented APIs to talk DDC2 with external monitors via I2C. The biggest negative aspect here is the relatively poor access to this feature within an operating system like MacOS, which can change on a whim, as found out recently.Ĭurrent displays implement DDC2, which is based around an I 2C bus. Display Data Channel (DDC) is a very useful feature of modern digital displays, as it allows the graphics card (and thus the OS) to communicate with a display and control features such as brightness and contrast.
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