HDMI-muxed debug port methods and apparatuses

A computing device comprising:

• a high-definition multimedia interface (HDMI) port;
• a high-definition multimedia interface (HDMI) module to detect an extended display identification data (EDID) code indicating a debug cable or debug host device coupled to the high-definition multimedia interface (HDMI) port, and to disable a display data channel (DDC) bus of the high-definition multimedia interface (HDMI) port in response to the extended display identification data (EDID) code indicating the debug cable or debug host device;
• and
• a universal asynchronous receiver and transceiver (UART) to transmit and receive debug commands and data on a serial input (RXD) and serial output (TXD) of the high-definition multimedia interface (HDMI) port, in response to the extended display identification data EDID) code indicating the debug cable or debug host device, wherein the computing device acts substantially similar to a universal serial bus (USB) slave bridge device.