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I have 2 monitors, one 144hz and one 75hz. I can't use anything that only has X for that reason :/
Is that generally an issue on Linux Mint / Cinnamon X11? I have a 144 Hz and a 70 Hz monitor and they seem to work fine....
As far as I know, unless Mint has patched something very recently, that 144hz monitor is throttled to 70 right now. You still probably have better frame times, which matters, but is obviously not the same as a higher refresh rate.
It's just a fundamental flaw in X11's design that can't be fixed as far as I know.
I'm pretty sure that my desktop is drawn at 144 Hz (on the primary display) and
xrandralso tells me that that's the active mode. 🤷♂️Edit: This is with Nvidia (proprietary drivers) and VRR monitors.
If they somehow managed to patch it then that's awesome, what does this say? I remember having a similar thing where it said one refresh rate but actually drew another.
It says "UNSUPPORTED: VSYNC is not available on the Linux platform." and runs at a stuttery 133 fps. This test shows 144 Hz: https://fpstest.org/refresh-rate-test/ The Nvidia settings app shows 144 Hz + VRR are active and I can see that the cursor is rendered at >70 fps.
Then I'll have to dual-boot and see if I can get it to work with my GPU :D
Good luck :)