The HDMI Forum rejected AMD's open source HDMI 2.1 implementation
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The HDMI Forum rejected AMD's open source HDMI 2.1 implementation
https://www.gamingonlinux.com/2024/02/the-hdmi-forum-rejected-amds-open-source-hdmi-21-implementation/
If you were hoping at some point to see HDMI 2.1+ on Linux with AMD + Mesa, you're out of luck right now as it's simply not going to be happening.