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Add very dirty workaround for setting locale in system settings
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To use KDE Plasma, add this to your configuration.nix:
To use KDE Plasma, add this to your configuration.nix:


{{file|3=# Enable Plasma  
{{file|3={
services.desktopManager.plasma6.enable = true;
  # Enable Plasma  
  services = {
    desktopManager.plasma6.enable = true;


# Default display manager for Plasma
  # Default display manager for Plasma
services.displayManager.plasma-login-manager.enable = true;
    displayManager.plasma-login-manager.enable = true;
 
# Optionally enable xserver
services.xserver.enable = true;|name=/etc/nixos/configuration.nix|lang=nix}}


  # Optionally enable xserver
  # xserver.enable = true;
  };
}|name=configuration.nix|lang=nix}}
== Configuration ==
== Configuration ==


=== Rootless X11 ===
=== Excluding applications from the default install ===


{{ic|sddm}} launches X11 as a root user by default. For better security, X11 can be run as a non-root user, but using Wayland is better tested and thus preferred:
Some optional packages can be excluded if they are not needed at the cost of functionality.


<syntaxhighlight lang="nix">
Optional packages: [https://github.com/NixOS/nixpkgs/blob/7e495b747b51f95ae15e74377c5ce1fe69c1765f/nixos/modules/services/desktop-managers/plasma6.nix#L150-L170]
# Using X11 as a non-root user
services.displayManager.plasma-login-manager.settings.General.DisplayServer = "x11-user";


# Using Wayland (preferred)
{{File|3={
services.displayManager.plasma-login-manager.settings.General.DisplayServer = "wayland";
  environment.plasma6.excludePackages = with pkgs.kdePackages; [
</syntaxhighlight>
    plasma-browser-integration
    konsole
    elisa
  ];
}|name=configuration.nix|lang=nix}}


=== Excluding applications from the default install ===
=== Default Wayland/X11 session ===


Some optional packages can be excluded if they are not needed at the cost of functionality.
Plasma 6 runs on Wayland by default. To launch an X11 session by default:


Optional packages: [https://github.com/NixOS/nixpkgs/blob/nixos-24.11/nixos/modules/services/desktop-managers/plasma6.nix#L159-L174 plasma6.nix]
{{File|3={ 
  services.displayManager.defaultSession = "plasmax11";
}|name=configuration.nix|lang=nix}}


<syntaxHighlight lang=nix>
environment.plasma6.excludePackages = with pkgs.kdePackages; [
  plasma-browser-integration
  konsole
  elisa
];
</syntaxHighlight>


=== Default Wayland/X11 session ===
=== Unlock KDE Wallet with LUKS password ===


Plasma 6 runs on Wayland by default. To launch an X11 session by default:
When using LUKS disk encryption and autologin in your display manager, it is possible to unlock KDE Wallet with the LUKS password. Set the LUKS password, login password, and KWallet keyring password all to the same string, and for NixOS 25.11 and below use the following configuration:
<syntaxhighlight lang="nix">
{
  boot.initrd.systemd.enable = true;
  systemd.services.display-manager.serviceConfig.KeyringMode = "inherit";
  security.pam.services.sddm-autologin.text = pkgs.lib.mkBefore ''
    auth optional ${pkgs.systemd}/lib/security/pam_systemd_loadkey.so
    auth include sddm
  '';
}
</syntaxhighlight>


For Plasma Login Manager in NixOS 26.05 or above, use:
<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
services.displayManager.defaultSession = "plasmax11";
{
  boot.initrd.systemd.enable = true;
  systemd.services.plasmalogin.serviceConfig.KeyringMode = "inherit";
  security.pam.services.plasmalogin-autologin.rules.auth = {
    systemd_loadkey = {
      order = 0;
      control = "optional";
      modulePath = "${pkgs.systemd}/lib/security/pam_systemd_loadkey.so";
    };
    plasmalogin = {
      order = 1;
      control = "include";
      modulePath = "plasmalogin";
    };
  };
}
</syntaxhighlight>
</syntaxhighlight>


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=== Brightness and Color brightness control sets gamma instead of brightness on external monitors ===
=== Brightness and Color brightness control sets gamma instead of brightness on external monitors ===
To allow <code>powerdevil</code> (and by extension the "Brightness and Color" status tray menu) to control brightness on supported monitors directly instead of adjusting gamma, [[Backlight#Via ddcutil|configure your system to enable ddcutil]], and allow your user to use DDC/CI without root.
To allow <code>powerdevil</code> (and by extension the "Brightness and Color" status tray menu) to control brightness on supported monitors directly instead of adjusting gamma, [[Backlight#Via ddcutil|configure your system to enable ddcutil]], and allow your user to use DDC/CI without root. Note that you do not need to add <code>ddcutil</code> to your system packages because PowerDevil uses libddcutil.
 
=== Plasma wallpaper reverts back to default after a Nix GC ===
When setting a wallpaper, Plasma may save the path as a <code>/nix/store/*/share/wallpapers</code> path instead of <code>/run/current-system/sw/share/wallpapers/</code>. To fix this, open <code>$XDG_CONFIG_HOME/plasma-org.kde.plasma.desktop-appletsrc</code> and manually change the paths.
 
=== No available locale settings in the Plasma system settings ===
The "Region & Language" page in the Plasma system settings is somewhat broken on NixOS. Instead, edit the <code>$XDG_CONFIG_HOME/plasma-localerc</code> file.
 
If you really want to configure locale in settings, you can use this workaround:
<syntaxhighlight lang="nix">
{ pkgs, ... }:
{
  i18n = {
    extraLocales = "all";
    imperativeLocale = true; # Unknown if needed (system settings sets user-level override?)
  };
  environment = {
    systemPackages = [ pkgs.stdenv.cc.libc.out ]; # this derivation contains the locales
    pathsToLink = [ "/share/i18n" ];
  };
}
</syntaxhighlight>
 
Switch to that configuration, then run:
 
<syntaxhighlight lang="bash">
sudo mkdir -p /usr/share/i18n
sudo ln -s /run/current-system/sw/share/i18n/locales /usr/share/i18n/locales
</syntaxhighlight>
That is a very dirty command, and I don't know if it persists across reboots.


== Tips and tricks ==
== Tips and tricks ==
Line 100: Line 155:
=== Plasma-Manager ===
=== Plasma-Manager ===


{{note|  [https://github.com/pjones/plasma-manager Plasma-Manager] is an unofficial community project and is not yet mature}}  
{{note|  [https://github.com/nix-community/plasma-manager Plasma-Manager] is a community project}}  
By default, the Plasma configuration can be handled like on [https://wiki.archlinux.org/title/KDE traditional systems].  
By default, the Plasma configuration can be handled like on [https://wiki.archlinux.org/title/KDE traditional systems].  
With [https://github.com/pjones/plasma-manager plasma-manager], it is possible to make Plasma configurations via nix by providing [https://github.com/nix-community/home-manager home-manager] modules.
With [https://github.com/nix-community/plasma-manager plasma-manager], it is possible to make Plasma configurations via nix by providing [https://github.com/nix-community/home-manager home-manager] modules.


=== User icon (avatar) ===
=== User icon (avatar) ===
Retrieved from "https://wiki.nixos.org/wiki/KDE"