I would use gamescope for this: gamescope -W 1440 -H 960 -f -- %command%
I use the game's FSR for this if it's available though. FSR Performance halves the render resolution, and scales the output 2x.
Arch has a useful doc for it https://wiki.archlinux.org/title/Gamescope
Unfortunately I cannot install gamescope, running Linux mint, and it is not apart of the packages. And the build instructions requires multiple library downgrades, and when it was done, it spat out a Wayland error.]
I believe this is also relevant for Ubuntu 24.04 as well.
EDIT: Oh and after a reset I borked my Mint install. Thank you snapshots for the rescue
If these are Steam games, the Steam flatpak has gamescope available.
steam deb, I've had issues with Flatpak. Also using other launchers
One last suggestion would be to try a Wayland session instead of X. I wouldn't be surprised if it improves the blurriness.
Aside from that, I also have a Framework 13 with the same display and Fedora's real nice on it ๐
Wayland support in Mint is very early stages and doesn't seem like much of a priority, as at this point its considered "experimental".
You'd have a lot better luck with pretty near anything else thats been working with Wayland for a long time, like Fedora, Ubuntu, Arch, etc. Plasma is probably a better substitute for Gnome when you're coming off Cinnamon but both should let you use custom resolutions out of the box.
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