https://www.allsupported.com/how-to-stop-black-screen-flickering-nvidia-ubuntu-cinnamon-mint/

<aside> 💡 • Open your application menu

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<aside> 💡 • Search “nvidia”: You’ll find “NVIDIA X Server Settings” – click that

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<aside> 💡 • Turn off Dithering: I found it under GPU 0 – (your GeForce name) -> DFP-0 (your monitor name)  Repeat for all monitors.

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<aside> 💡 • Turn off Flipping: X Screen 0 -> OpenGL Settings -> Allow Flipping (uncheck)

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<aside> 💡 잠시 기다립니다… 바로 효과가 안나타날 수 있습니다. 한 3~4분 정도만 기다려보세요!

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