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The HDMI Forum rejected AMD's open source HDMI 2.1 implementation
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this post was submitted on 29 Feb 2024
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ive found that the issue in my experience is that X11 only supports a max of 4k60, but Wayland supports 4k120 and beyond. I dont think the cable matters as the same cable im using works on windows with 4k160.
It's a matter of cable bandwidth. 4k120 4:4:4 requires more bandwidth than hdmi 2.0 can provide. You can drop down to 4:2:0, but that's a pretty bad experience and ruins the image quality.
I've been using an adapter cable, but it's really flaky, I don't know if it's a bad cable or what. But a normal hdmi cable just plain works on Windows, since the windows amd driver supports hdmi 2.1.
yes, that is a valid factor. i meant more towards the type of cable doesn't mater. but yes an up to date spec of the cable is also just as important