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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.
Do you have adaptive sync on? If you do try turning it off for both monitors. That worked for me but your milage may vary.
I don't even know what that is, frankly.
It's a generic term for Freesync/GSync, having a variable refresh rate.
Oh. No, my monitors should always be at 60Hz now. They're both DC powered (internal + USB).