Sway not working

I have been attempting to run sway through sddm alongside kde as seperate sessions. What happens is when I switch to the new build and log out, sway appears in sddm but when launched it is just the classic white blinking line in the top left. After awhile it stops blinking. Then, whether I have opened sway or not, upon rebooting sway no longer appears. I’ll drop the config below, it is a little unusual since people have helped me on discord, but the result hasn’t changed.

# Edit this configuration file to define what should be installed on
# your system. Help is available in the configuration.nix(5) man page, on
# https://search.nixos.org/options and in the NixOS manual (`nixos-help`).

{ config, lib, pkgs, ... }:

{
  
  services.gnome.gnome-keyring.enable = true;
  programs.sway = {
    enable = true;
    wrapperFeatures.gtk = true;
  };

  services.displayManager.sddm.enable = true;
  services.desktopManager.plasma6.enable = true;

  # Network config

  networking.hostName = "francisnixos"; # Define your hostname.
  # Pick only one of the below networking options.
  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
  networking.networkmanager.enable = true;  # Easiest to use and most distros use this by default.

  # Set your time zone.
  # time.timeZone = "Europe/Amsterdam";

  # Configure network proxy if necessary
  # networking.proxy.default = "http://user:password@proxy:port/";
  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";

  # Select internationalisation properties.
  # i18n.defaultLocale = "en_US.UTF-8";
  # console = {
  #   font = "Lat2-Terminus16";
  #   keyMap = "us";
  #   useXkbConfig = true; # use xkb.options in tty.
  # };

  # Enable the OpenSSH daemon.
  # services.openssh.enable = true;

  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ ... ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  # networking.firewall.enable = false;

  # Graphics config

  hardware.opengl = {
    enable = true;
  };

  services.xserver = {
    enable = true;
    libinput.enable = true;
  #  displayManager.sddm.enable = true;
  #  desktopManager.plasma6.enable = true;
  };  

  nixpkgs.config.allowUnfree = true;
  services.xserver.videoDrivers = [ "nvidia" ];
  
  hardware.graphics = {
    enable = true; 
  };

  hardware.graphics.extraPackages = with pkgs; [
    intel-vaapi-driver
    intel-media-driver];

  hardware.nvidia = {
   modesetting.enable = true;
   powerManagement.enable = true;
   open = true;
   # nvidiaSettings = true;
   package = config.boot.kernelPackages.nvidiaPackages.stable;
  };

  boot.kernelParams = ["i915.force_probe=7d55"];

   # hardware.nvidia.prime = {
     # sync.enable = true;
     # nvidiaBusId = "PCI:1:0:0";
     # intelBusId = "PCI:0:2:0";
   # };

  # Audio config

  #  hardware.pulseaudio.enable = true;
  #  hardware.pulseaudio.support32Bit = true;

  services.pipewire = {
    enable = true;
    pulse.enable  = true;
    alsa.enable = true;
    alsa.support32Bit = true;
  };
  security.rtkit.enable = true;

  # Packages config

  environment.systemPackages = with pkgs; [
    vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
    wget
    fastfetch
    alacritty
    lshw
    pciutils
    nvitop
    brave
    rtkit
    plasma-pa
    whitesur-kde
    #  whitesur-icon-theme
    legcord
    firefox
    spotify
    libreoffice-qt6-fresh
    git
    jdk23
    alacritty-theme
    gnomeExtensions.toggle-alacritty
    neofetch
    vscode
    grim
    slurp
    wl-clipboard
    mako
    tree
    gparted
  ];

  programs.neovim = {
    enable = true;
    defaultEditor = true;
  };

  programs.steam.enable = true;
  programs.thunderbird.enable = true;

  programs.virt-manager.enable = true;
  users.groups.libvirtd.members = ["francis"];
  virtualisation.libvirtd.enable = true;
  virtualisation.spiceUSBRedirection.enable = true;

  # NixOS version config

  # This option defines the first version of NixOS you have installed on this particular machine,
  # and is used to maintain compatibility with application data (e.g. databases) created on older NixOS versions.
  #
  # Most users should NEVER change this value after the initial install, for any reason,
  # even if you've upgraded your system to a new NixOS release.
  #
  # This value does NOT affect the Nixpkgs version your packages and OS are pulled from,
  # so changing it will NOT upgrade your system - see https://nixos.org/manual/nixos/stable/#sec-upgrading for how
  # to actually do that.
  #
  # This value being lower than the current NixOS release does NOT mean your system is
  # out of date, out of support, or vulnerable.
  #
  # Do NOT change this value unless you have manually inspected all the changes it would make to your configuration,
  # and migrated your data accordingly.
  #
  # For more information, see `man configuration.nix` or https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
  system.stateVersion = "24.11"; # Did you read the comment?

  # Boot config

  boot.loader.grub.device = "nodev";
  boot.loader.grub.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
  boot.loader.grub.useOSProber = true;
  boot.loader.grub.efiSupport = true;
  boot.loader.efi.efiSysMountPoint = "/boot";
  boot.loader.systemd-boot.enable = false;

  # Automatic updating

  system.autoUpgrade.enable = true;
  system.autoUpgrade.dates = "weekly";
  
  # Automatic build cleanup

  nix.gc.automatic = true;
  nix.gc.dates = "daily";
  nix.gc.options = "--delete-older-than 10d";
  nix.settings.auto-optimise-store = true; 

  # Flake config
  nix.settings.experimental-features = ["nix-command" "flakes"];

  users.users.francis = {
    isNormalUser = true;
    description = "Francis";
    extraGroups = [ "wheel" ];
    shell = pkgs.bash;
    home = "/home/francis";
  };
 
  xdg.portal = {
    enable = true;
    wlr.enable = true;
  };

  swapDevices = [{
    device = "/swapfile";
    size = 16 * 1024;
  }];

  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
    ];

  # Configure x11 keymap
   services.xserver.xkb.layout = "us";

  # services.xserver.xkb.options = "eurosign:e,caps:escape";

  # Enable CUPS to print documents.
  # services.printing.enable = true;
  
  # Enable touchpad support (enabled default in most desktopManager).
  # services.libinput.enable = true;

  # Define a user account. Don't forget to set a password with ‘passwd’.
  #  users.users.francis = {
  #   isNormalUser = true;
  #   extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
  #   packages = with pkgs; [
  #     tree
  #   ];
  #  };

  # List packages installed in system profile. To search, run:
  # $ nix search wget

  # Some programs need SUID wrappers, can be configured further or are
  # started in user sessions.
  # programs.mtr.enable = true;
  # programs.gnupg.agent = {
  #   enable = true;
  #   enableSSHSupport = true;
  # };

  # Copy the NixOS configuration file and link it from the resulting system
  # (/run/current-system/configuration.nix). This is useful in case you
  # accidentally delete configuration.nix.
  # system.copySystemConfiguration = true;

  # Set your time zone.
  # time.timeZone = "Europe/Amsterdam";
 
}

Hello
Have you tried starting sway from the terminal (tty)?
Also have you tried another displaymanager?

I have only tried to run diagnostics from tty. What command would I use? I wasn’t aware this was a thing lol. I will try gdm, hopefully it doesnt hang my system.

Just with sway in the command line
https://wiki.archlinux.org/title/Sway#Manually