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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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Every time I plug a second monitor into my Linux PC (Mint), both screens start blinking on and off. Sometimes Win+P works, sometimes it doesn't. I've asked in the Discord, I've tried arandr. Nothing works.
3 monitors here and working fine on Elementary OS, Super+P works as well. Are you on Wayland or X11?
Whatever Cinnamon runs on natively. I have no idea beyond that.
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.