Expect HDMI 2.2 introduced new Ultra96 certified cables while DisplayPort 2.1b brings DP80LL active cables offering 80 Gbps throughput over lengths of up to three meters ...
At a minimum, eARC requires that both an audio device and its connected HDMI port support HDMI 2.1. If you're unsure, check your audio gear's specifications, and connect it to the port marked ...