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


== Installation ==
== Installation ==
Line 7: Line 7:
{{file|/etc/nixos/configuration.nix|nix|<nowiki>
{{file|/etc/nixos/configuration.nix|nix|<nowiki>
{
{
   services.xserver.enable = true;
   services.xserver.enable = true; # optional
   services.displayManager.sddm.enable = true;
   services.displayManager.sddm.enable = true;
   services.displayManager.sddm.wayland.enable = true;
   services.displayManager.sddm.wayland.enable = true;
Line 28: Line 28:
=== Rootless X11 ===
=== 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 preferred and better tested:
{{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>
<syntaxHighlight lang=nix>
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=== Excluding applications from the default install ===
=== Excluding applications from the default install ===


Some optional packages that are installed by default can be excluded if they are not needed.
Some optional packages can be excluded if they are not needed at the cost of functionality.


==== Plasma 5 ====
==== Plasma 6 ====


Optional packages: [https://github.com/NixOS/nixpkgs/blob/nixos-23.11/nixos/modules/services/x11/desktop-managers/plasma5.nix#L275-L284 plasma5.nix]
Optional packages: [https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/services/desktop-managers/plasma6.nix#L136-L149 plasma6.nix]


<syntaxHighlight lang=nix>
<syntaxHighlight lang=nix>
environment.plasma5.excludePackages = with pkgs.libsForQt5; [
environment.plasma6.excludePackages = with pkgs.kdePackages; [
   plasma-browser-integration
   plasma-browser-integration
   konsole
   konsole
   oxygen
   elisa
];
];
</syntaxHighlight>
</syntaxHighlight>


==== Plasma 6 ====
==== Plasma 5 ====


Optional packages: [https://github.com/NixOS/nixpkgs/blob/ff0dbd94265ac470dda06a657d5fe49de93b4599/nixos/modules/services/desktop-managers/plasma6.nix#L153-L165 plasma6.nix]
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>
<syntaxHighlight lang=nix>
environment.plasma6.excludePackages = with pkgs.kdePackages; [
environment.plasma5.excludePackages = with pkgs.libsForQt5; [
   plasma-browser-integration
   plasma-browser-integration
   konsole
   konsole
   elisa
   oxygen
];
];
</syntaxHighlight>
</syntaxHighlight>
Line 92: Line 92:


=== Default Wayland/X11 session ===
=== Default Wayland/X11 session ===
==== Plasma 5 ====
Plasma 5 runs on X11 by default and it is recommend to use Plasma 6 for Wayland instead. To launch a Wayland session by default anyway:
<syntaxHighlight lang=nix>
services.xserver.displayManager.defaultSession = "plasmawayland";
</syntaxHighlight>


==== Plasma 6 ====
==== Plasma 6 ====
Line 115: Line 107:
</syntaxHighlight>
</syntaxHighlight>


== Troubleshooting ==
==== Plasma 5 ====
 
=== No Sound switching from Gnome ===


Gnome module has audio enabled, while Plasma will run without sound. So an additional step would be to enable pulseaudio or pipewire
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>
  hardware.pipewire.enable = true;
services.xserver.displayManager.defaultSession = "plasmawayland";
</syntaxHighlight>
</syntaxHighlight>
== Troubleshooting ==


=== Qt/KDE applications segfault on start ===
=== Qt/KDE applications segfault on start ===
Line 136: Line 128:
This affects GTK applications including Firefox and Thunderbird.
This affects GTK applications including Firefox and Thunderbird.


If you are using Plasma 5, add to your configuration.nix the following line:
You may need to set a GTK theme ''Breeze'' imitating the KDE theme with the same name in ''System Settings -> Application Style -->Configure GNOME/GTK Application Style''.
 
<syntaxHighlight lang=nix>
programs.dconf.enable = true;
</syntaxHighlight>
 
You might also need to set a GTK theme ''Breeze'' imitating the KDE theme with the same name in ''System Settings -> Application Style -->Configure GNOME/GTK Application Style''.


[https://github.com/NixOS/nixpkgs/issues/180720 (See this issue)]
[https://github.com/NixOS/nixpkgs/issues/180720 (See this issue)]
Line 150: Line 136:
=== Plasma-Manager ===
=== Plasma-Manager ===


{{note|  [https://github.com/pjones/plasma-manager Plasma-Manager] is not matured yet and unofficial community project}}  
{{note|  [https://github.com/pjones/plasma-manager Plasma-Manager] is an unofficial community project and is not yet mature}}  
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/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.
=== User icon (avatar) ===
You can add a profile picture to your user by using a png file in <code>~/.face.icon</code>.


[[Category:Desktop environment]]
[[Category:Desktop environment]]
[[Category:Applications]]
[[Category:Applications]]
[[Category:KDE]]

Latest revision as of 05:48, 20 October 2024

KDE Plasma is a desktop environment that aims to be simple by default, powerful when needed.

Installation

Plasma 6

/etc/nixos/configuration.nix

{
  services.xserver.enable = true; # optional
  services.displayManager.sddm.enable = true;
  services.displayManager.sddm.wayland.enable = true;
  services.desktopManager.plasma6.enable = true;
}

Plasma 5

/etc/nixos/configuration.nix

{
  services.xserver.enable = true;
  services.displayManager.sddm.enable = true;
  services.xserver.desktopManager.plasma5.enable = true;
}

Configuration

Rootless X11

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: 

services.xserver.displayManager.sddm.settings.General.DisplayServer = "x11-user";

Excluding applications from the default install

Some optional packages can be excluded if they are not needed at the cost of functionality.

Plasma 6

Optional packages: plasma6.nix 

environment.plasma6.excludePackages = with pkgs.kdePackages; [
  plasma-browser-integration
  konsole
  elisa
];

Plasma 5

Optional packages: plasma5.nix 

environment.plasma5.excludePackages = with pkgs.libsForQt5; [
  plasma-browser-integration
  konsole
  oxygen
];

GNOME desktop integration

Using the following example configuration, QT applications will have a look similar to the GNOME desktop, using a dark theme. 

qt = {
  enable = true;
  platformTheme = "gnome";
  style.name = "adwaita-dark";
};

For other themes, you may need the packages libsForQt5.qt5ct and libsForQt5.qtstyleplugin-kvantum and a symlink from ~/.config/Kvantum/ to your theme package. Here is an example using Arc-Dark and Home Manager. In the Home Manager configuration: 

qt = {
  enable = true;
  platformTheme = "qtct";
  style.name = "kvantum";
};

xdg.configFile = {
  "Kvantum/ArcDark".source = "${pkgs.arc-kde-theme}/share/Kvantum/ArcDark";
  "Kvantum/kvantum.kvconfig".text = "[General]\ntheme=ArcDark";
};

For more details, see this forum post.

Default Wayland/X11 session

Plasma 6

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

services.xserver.displayManager.defaultSession = "plasmax11";

SDDM on Wayland

services.xserver.displayManager.sddm.wayland.enable = true;

Plasma 5

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: 

services.xserver.displayManager.defaultSession = "plasmawayland";

Troubleshooting

Qt/KDE applications segfault on start

This is caused by a stale QML cache (see this issue). A dirty way to fix this is by running on a terminal the following command: 

find ${XDG_CACHE_HOME:-$HOME/.cache}/**/qmlcache -type f -delete

GTK themes are not applied in Wayland applications / Window Decorations missing / Cursor looks different

This affects GTK applications including Firefox and Thunderbird.

You may need to set a GTK theme Breeze imitating the KDE theme with the same name in System Settings -> Application Style -->Configure GNOME/GTK Application Style.

(See this issue)

Tips and tricks

Plasma-Manager

Note: Plasma-Manager is an unofficial community project and is not yet mature

By default, the Plasma configuration can be handled like on traditional systems. With plasma-manager, it is possible to make Plasma configurations via nix by providing home-manager modules.

User icon (avatar)

You can add a profile picture to your user by using a png file in ~/.face.icon.

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