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The HDMI Forum rejected AMD's open source HDMI 2.1 implementation
(www.gamingonlinux.com)
This is a most excellent place for technology news and articles.
indeed, parent's conflation of C64 and *nix threw me off (as I guess it did others), but your comment helps to put it into perspective.
proprietary can drive FLOSS innovation, but its so hard to get around proprietary entrenchment - especially wrt consumer facing tech.