Hello, I hope that here is correct place to ask about IOKit. Part of code and a little more info here: Is there is any known issues in i2c communication with display? Maybe request structure filled wrong? Will be great to hear even guesses. Thank you. Best regards, Vitaly Bondar _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app... This email sent to site_archiver@lists.apple.com I have faced problem with IOI2CSendRequest function from "IOKit/i2c/IOI2CInterface.h" Apple example for fetching EDID from display (using of oxA0 and oxA1 addresses) works fine. But when i'm trying to use 0x6e/0x6F addresses - can't receive response from display. If i send write command to display, like set brightness, i see that it is applied on display. But when i send command for fetching something - it is not works. The commands itself is correct because same things works in Windows realization. http://stackoverflow.com/questions/11561623/i2c-communication-in-iokit-on-ma...