config/profiles/no-suspend.nix

{
  systemd.targets.sleep.enable = false;
  systemd.targets.suspend.enable = false;
  systemd.targets.hibernate.enable = false;
  systemd.targets.hybrid-sleep.enable = false;

  services.xserver.displayManager.gdm.autoSuspend = false;

  security.polkit.enable = true;
  security.polkit.extraConfig = ''
    polkit.addRule(function(action, subject) {
        if (action.id == "org.freedesktop.login1.suspend" ||
            action.id == "org.freedesktop.login1.suspend-multiple-sessions" ||
            action.id == "org.freedesktop.login1.hibernate" ||
            action.id == "org.freedesktop.login1.hibernate-multiple-sessions")
        {
            return polkit.Result.NO;
        }
    });
  '';

}