Sway starts, but crashes within seconds. Longest I've got it to run was half an hour before everything froze.
Do any other WM's/DE's work better for old Nvidia cards? I don't particularly want to start installing all the Wayland things out there until one works hah.
I understand Nvidia isn't great for Wayland...
Other than that for the first time in like a decade of dealing with Optimus bullshit laptops off and on everything finally works plug and play, even running different refresh rate screens at the same time. Nvidia finally shipped support for controlling gamma in wayland on Halloween so I can use gammastep to shift my screens red at night.
In short: Have that patch for wlroots (which sway uses), use newest proprietary driver, block/uninstall nouveau, and make sure the system isn't loading CPU rendering due to a misconfiguration (firefox you can check about:support, chromium/electron-based shit check chrome://gpu)
EDIT: oh and since chromium/electron will inevitably temporarily break graphics at some point due to an update... --disable-gpu is your friend to get those apps working (with CPU rendering). Obviously drop it out once those problems subside, it's happened maybe twice to me in the past few months running Gentoo unstable. Firefox seems more resilient and will find a way to run in less ideal circumstances on wayland.
I think it's mainly just environment variables, so if you're on another distro you can have a look at the the GitHub repo and implement it yourself.
The biggest nvidia issue I encountered are problems with display managers, GDM would sometimes not start wayland compositors or not start x11 WMs. I tried several others as well and always had issues (never had issues on my previous AMD or Intel machines). I ended up just autostarting a locked sway desktop and everything just works.