According to the newly release HDMI 2.1a Amendment 1 specification, longer HDMI cable runs will soon be possible, even without the help of an additional power source. Amendment 1 introduces “Cable ...
TL;DR: Longer active HDMI cables usually have a micro USB or USB-C connector to supply power to the internal chipset used for signal boosting. These ports won't be needed anymore if you get a cable ...
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