Isn't this backwards? Reading the spec (well, the wikipedia page) for DVI, and making some educated guesses, it seems to me the only way to know that a DVi->HDM

Isn't this backwards? Reading the spec (well, the wikipedia page) for DVI, and making some educated guesses, it seems to me the only way to know that a DVi->HDMI adapter is connected is if it provides EDID saying it is an HDMI device. What is EDID I hear you ask? Well, it's extended display identification data. Physically, it's provided by an EEPROM on the I2C bus of the DVI port at address 0x50. Could it be as simple as only AMD providing adapters that accurately portray themselves as HDMI devices? EDIT TO ENTIRELY REVERSE IMPLICATION OF ABOVE QUESTION: No, it sounds like said EEPROM is necessary to make the video part of such an adapter work at all. It seems AMD additionally identify if it is a blessed adapter and only send audio packets if that is the case. Definitely annoying, but fair given that there is no actual standard. People would definitely moan more if AMD cards blew up non-AMD adapters/monitors connected via non-AMD adapters.