[SOLVED] Exit Hyprland on NixOS always give me black screen

[rollschild]

Hi,

I'm moving from Sway to Hyprland. I have KDE as well and sort of use it as "Display Manager", i.e. when my machine finishes booting up, a KDE login screen shows up with a few options on the bottom left corner: Sway, KDE, Hyprland (UWSM), etc. And that's how I log in to Sway or Hyprland.

And I'm using UWSM.

The problem is, I couldn't figure out a way to gracefully exit Hyprland and go back to the login page. I've tried every option on Hyprland wiki as well as UWSM wiki but none of them work. It always log me out altogether and give me a black empty screen with a cursor blinking. I couldn't do anything else other than force power off my machine.

Here is the config that's relevant:
home.nix:

wayland.windowManager.hyprland = {
    enable = true;
    # set the Hyprland and XDPH packages to null to use the ones from the NixOS module
    # package = null;
    # portalPackage = null;
    systemd = {
      # disable the systemd integration, as it conflicts with uwsm.
      enable = false;
      variables = [ "--all" ];
    };
}

configuration.nix:

# hyprland setup
  programs.uwsm = {
    enable = true;
    waylandCompositors = {
      hyprland = {
        prettyName = "Hyprland";
        comment = "Hyprland compositor managed by UWSM";
        binPath = "/run/current-system/sw/bin/Hyprland";
      };
    };
  };
  programs.hyprland.withUWSM = true;
  programs.hyprland.enable = true;

I don't believe I have other UWSM related configs anywhere else. I tried things like:
sleep 1; loginctl terminate-user $USER
loginctl terminate-user ""
but they all give me the black screen.

The only difference is hyprctl dispatch exit, which is dicouraged by Hyprland wiki, but it's the only command that can log me out back to the original graphical log in screen. However, when attempting to log back in, it gives me the black screen again so essentially no difference.

Please help. Thanks!

[rollschild]

I solved this issue by:

1. Add services.displayManager.sddm.wayland.enable = true; to my configuration.nix
2. Change my exit script/command to uwsm stop