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Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux
(www.heise.de)
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this post was submitted on 10 Dec 2025
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Whatever Cinnamon runs on natively. I have no idea beyond that.
Last I heard Cinnamon does not have stable Wayland support yet. One of the reasons Wayland was made is because multi-screen support on the old X11 is an ugly hack. Unlike wayland, it doesn't play well with screens of different resolutions, refresh rates, adaptive sync compatibility or HDR.
Oh, then it's probably that issue.
Then it would be best to check the version of your distro and session, then go to their github issue list and search for it, if there isn't one provide a issue for them to look at. I also recommend verifying if it's not a hardware issue or cable fault.