HDMI Forum Rejects Open-Source HDMI 2.1 Driver Support Sought By AMD - Phoronix
phoronix.com
For three years there has been a bug report around 4K@120Hz being unavailable via HDMI 2.1 on the AMD Linux driver.
The wait continues...
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This is the first time I heard of Ethernet over HDMI and I can't tell if you're joking.
https://en.wikipedia.org/wiki/Hdmi_hec