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[https://kde.org/de/plasma-desktop/ KDE Plasma] is a desktop environment that aims to be simple by default, powerful when needed.
[https://kde.org/plasma-desktop/ KDE Plasma] is a desktop environment that aims to be simple by default, powerful when needed.


== Installation ==
== Installation ==


=== Plasma 6 ===
To use KDE Plasma, add this to your configuration.nix:


{{file|/etc/nixos/configuration.nix|nix|<nowiki>
{{file|3={
{
   # Enable Plasma
   services.xserver.enable = true; # optional
   services = {
   services.displayManager.sddm.enable = true;
    desktopManager.plasma6.enable = true;
  services.displayManager.sddm.wayland.enable = true;
  services.desktopManager.plasma6.enable = true;
}
</nowiki>}}


=== Plasma 5 ===
  # Default display manager for Plasma
 
    displayManager.plasma-login-manager.enable = true;
{{file|/etc/nixos/configuration.nix|nix|<nowiki>
{
  services.xserver.enable = true;
  services.displayManager.sddm.enable = true;
  services.xserver.desktopManager.plasma5.enable = true;
}
</nowiki>}}


  # Optionally enable xserver
  # xserver.enable = true;
  };
}|name=configuration.nix|lang=nix}}
== Configuration ==
== Configuration ==
=== Rootless X11 ===
{{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:
<syntaxhighlight lang="nix">
# Using X11 as a non-root user
services.displayManager.sddm.settings.General.DisplayServer = "x11-user";
# Using Wayland (preferred)
services.displayManager.sddm.settings.General.DisplayServer = "wayland";
</syntaxhighlight>


=== Excluding applications from the default install ===
=== Excluding applications from the default install ===
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Some optional packages can be excluded if they are not needed at the cost of functionality.
Some optional packages can be excluded if they are not needed at the cost of functionality.


==== Plasma 6 ====
Optional packages: [https://github.com/NixOS/nixpkgs/blob/7e495b747b51f95ae15e74377c5ce1fe69c1765f/nixos/modules/services/desktop-managers/plasma6.nix#L150-L170]
 
Optional packages: [https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/services/desktop-managers/plasma6.nix#L136-L149 plasma6.nix]
 
<syntaxHighlight lang=nix>
environment.plasma6.excludePackages = with pkgs.kdePackages; [
  plasma-browser-integration
  konsole
  elisa
];
</syntaxHighlight>
 
==== Plasma 5 ====
 
Optional packages: [https://github.com/NixOS/nixpkgs/blob/nixos-24.05/nixos/modules/services/x11/desktop-managers/plasma5.nix#L278-L282 plasma5.nix]
 
<syntaxHighlight lang=nix>
environment.plasma5.excludePackages = with pkgs.libsForQt5; [
  plasma-browser-integration
  konsole
  oxygen
];
</syntaxHighlight>
 
=== GNOME desktop integration ===
 
Using the following example configuration, QT applications will have a look similar to the [[GNOME]] desktop, using a dark theme.
 
<syntaxhighlight lang="nix">
qt = {
  enable = true;
  platformTheme = "gnome";
  style = "adwaita-dark";
};
</syntaxhighlight>
 
For other themes, you may need the packages <code>libsForQt5.qt5ct</code> and <code>libsForQt5.qtstyleplugin-kvantum</code> and a symlink from <code>~/.config/Kvantum/</code> to your theme package. Here is an example using Arc-Dark and [[Home Manager]]. In the Home Manager configuration:
 
<syntaxhighlight lang="nix">
qt = {
  enable = true;
  platformTheme = "qtct";
  style = "kvantum";
};
 
xdg.configFile = {
  "Kvantum/ArcDark".source = "${pkgs.arc-kde-theme}/share/Kvantum/ArcDark";
  "Kvantum/kvantum.kvconfig".text = "[General]\ntheme=ArcDark";
};
</syntaxhighlight>


For more details, see [https://discourse.nixos.org/t/guide-to-installing-qt-theme/35523/2 this] forum post.
{{File|3={
  environment.plasma6.excludePackages = with pkgs.kdePackages; [
    plasma-browser-integration
    konsole
    elisa
  ];
}|name=configuration.nix|lang=nix}}


=== Default Wayland/X11 session ===
=== Default Wayland/X11 session ===


==== Plasma 6 ====
Plasma 6 runs on Wayland by default. To launch an X11 session by default:


Plasma 6 runs on Wayland by default. To launch an X11 session by default:
{{File|3={ 
  services.displayManager.defaultSession = "plasmax11";
}|name=configuration.nix|lang=nix}}


<syntaxhighlight lang="nix">
services.displayManager.defaultSession = "plasmax11";
</syntaxhighlight>


==== SDDM on Wayland ====
=== Unlock KDE Wallet with LUKS password ===


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">
<syntaxhighlight lang="nix">
services.displayManager.sddm.wayland.enable = true;
{
  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>
</syntaxhighlight>


==== Plasma 5 ====
For Plasma Login Manager in NixOS 26.05 or above, use:
 
Plasma 5 runs on X11 by default and it is recommended to use Wayland with Plasma 6 instead. To launch a Wayland session by default anyway:
 
<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
services.displayManager.defaultSession = "plasmawayland";
{
  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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=== Bluetooth configuration not available ===
=== Bluetooth configuration not available ===


Add the following configuration (generally in harwdare-configuration.nix):
Add the following configuration (generally in hardware-configuration.nix):


<syntaxHighlight lang=nix>
<syntaxHighlight lang=nix>
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]
]
</syntaxHighlight>
</syntaxHighlight>
=== 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. 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 ==
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=== 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) ===
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==== Using the worktree of a local repository ====
==== Using the worktree of a local repository ====
{{Note|Since this relies on reading directly from the filesystem during the build, the impure mode has to be used, e.g.: <code>nixos-rebuild --impure …</code>}}
Now one might not want to commit each and every change during development to iterate more quickly, but to just rebuild after having saved the latest changes.
Now one might not want to commit each and every change during development to iterate more quickly, but to just rebuild after having saved the latest changes.


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</syntaxhighlight>
</syntaxhighlight>
{{Note|Since this relies on reading directly from the filesystem during the build, the impure mode has to be used, e.g.: <code>nixos-rebuild --impure …</code>}}
[[Category:Desktop environment]]
[[Category:Desktop environment]]
[[Category:Applications]]
[[Category:Applications]]
[[Category:KDE]]
[[Category:KDE]]
Retrieved from "https://wiki.nixos.org/wiki/KDE"