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Manually reduce refresh rate with Nvidia proprietary drivers

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I have a Lenovo Legion 5 running Ubuntu 21.04, OEM Kernel 5.11.0-41, nvidia-driver-470, RTX 3050 mobile. The built-in display refresh rate is stuck at 165 according to xrandr, despite only officially being 144hz. Otherwise, my situation is exactly the same as somebody else described in this post on the Unix and Linux forums: https://unix.stackexchange.com/questions/679852/how-do-i-lower-my-screen-refresh-rate-down-to-60hz

To summarize: Display settings has no option to reduce the refresh rate. Setting it in Windows does not do anything. xrandr -r doesn't work, and xrandr output/mode/refresh does nothing. editing ~/.config/monitors.xml does nothing. Editing xorg.conf does nothing. xrandr --addmode fails with the "Badmatch" error that doesn't seem to have a clear solution on proprietary drivers.

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