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That's likely because the HDMI Forum don't allow open source HDMI 2.1. [0]

That said, there are signs that it's coming to the AMD drivers. [1] [2]

[0] https://arstechnica.com/gadgets/2024/02/hdmi-forum-to-amd-no...

[1] https://www.techpowerup.com/348723/amd-readies-full-open-sou...

[2] https://www.fosslinux.com/157755/hdmi-2-1-on-linux-complete-...



Seems like a case of under promising and planning to over deliver later. The hardware seems to be 2.1 but they haven't sorted out every feature in the drivers yet.




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