Display Manager

Athena OS uses SDDM as Display Manager because of its reliability and flexibility, in particular the sddm-astronaut-theme.

It offers several themes, static and dynamic, that can be set by editing:

Athena Arch
Athena Nix

/usr/share/sddm/themes/sddm-astronaut-theme/metadata.desktop:

[SddmGreeterTheme]
Name=sddm-astronaut-theme
Description=sddm-astronaut-theme
Author=keyitdev
Website=https://github.com/Keyitdev/sddm-astronaut-theme
License=GPL-3.0-or-later
Type=sddm-theme
Version=1.3
ConfigFile=Themes/astronaut.conf
Screenshot=Previews/astronaut.png
MainScript=Main.qml
TranslationsDirectory=translations
Theme-Id=sddm-astronaut-theme
Theme-API=2.0
QtVersion=6

To set a different theme, edit ConfigFile=Themes/astronaut.conf line by declaring your favourite .conf file. The name of the available config files can be found in /usr/share/sddm/themes/sddm-astronaut-theme/Themes directory.

/etc/nixos/modules/dms/sddm/default.nix :

    environment.systemPackages = with pkgs; [
      (sddm-astronaut.override {
        embeddedTheme = "cyberpunk";
      })
    ];

To set a different theme, edit embeddedTheme = "cyberpunk"; line by replacing its value by your favourite theme. The name of the available themes can be found between the filename, without extension, of files in the /run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Themes directory.