Additionally, I have tried different power saving settings in that nvidia-rtx.nix file, and disabling i915 with a boot kernel param
I have been told in other places that it could be due to SDDM or Plasma configs, but my config is bone stock with no changes made
Also I can boot into SDDM with Wayland using this
# Enable the X11 windowing system.
services.xserver.enable = true;
# Enable the KDE Plasma Desktop Environment.
services.xserver.displayManager.sddm.enable = true;
services.xserver.desktopManager.plasma5.enable = true;
# Use Wayland in Plasma and SDDM
services.xserver.displayManager.defaultSession = "plasma";
services.xserver.displayManager.sddm.wayland.enable = true;
but when I sign in with my user account is when I get the black screen with just a cursor