Stable still uses the 550.78 driver, so maybe you need to update that:
hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.mkDriver {
version = "555.58.02";
sha256_64bit = "sha256-xctt4TPRlOJ6r5S54h5W6PT6/3Zy2R4ASNFPu8TSHKM=";
sha256_aarch64 = "sha256-8hyRiGB+m2hL3c9MDA/Pon+Xl6E788MZ50WrrAGUVuY=";
openSha256 = "sha256-8hyRiGB+m2hL3c9MDA/Pon+Xl6E788MZ50WrrAGUVuY=";
settingsSha256 = "sha256-ZpuVZybW6CFN/gz9rx+UJvQ715FZnAOYfHn5jt5Z2C8=";
persistencedSha256 = "sha256-xctt4TPRlOJ6r5S54h5W6PT6/3Zy2R4ASNFPu8TSHKM=";
};
Nvidia anyway causes enough issues that I recommend overriding the NixOS package version to just about everyone - just make sure to stay up-to-date manually. Gamingonlinux’ nvidia category is pretty nice to point an RSS feed reader at to keep track of new drivers if you do this.
Maybe we should start an nvidia flake with accompanying docs to help work around all this stuff.