Mac mini HDMI port: DDC/CI does not work

App & System Services Drivers IOKit Core Graphics

Clement0618 OP

Created Jan ’21

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I connect 2020 Mac mini (Intel UHD Graphics 630 inside) with display monitor and test DDC/CI command.
The DDC/CI command can work well via Mac mini Thunderbolt port or Thunderbolt to HDMI adapter.
But DDC/CI command does not work on Mac mini "HDMI port" only.
Mac mini HDMI port does not send '6E' command ***** address in normally.
PS: The DDC/CI also can works well on 13" MacBookPro 2020 Thunderbolt port.

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