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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.
I have one too. Go take a look at Cable Matters. I am able to play games at 4k120 with my mac. See if something will work for you and you can always send a message to their customer support to ask questions.
Yeah thats the one I have. Maybe I'll ask their support. It has the latest firmware but it's so flaky about being able to do high bandwidth.