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sddm greeter

Vendor: SDDM Development Team
Developer: Abdurrahman Avci
License: GPL
Web: SDDM project page


SDDM (Simple Desktop Display Manager) is the preferred Display Manager for KDE Plasma 5 and LXQt. It supports X11 and Wayland. Themes are supported by QML.


  • Extremely themeable.
  • Support both of X11 and Wayland windowing systems.


SDDM configuration is loaded on the following order:

  • All files in /usr/lib/sddm/sddm.conf.d in alphabetical order
  • All files in /etc/sddm.conf.d in alphabetical order
  • Finally from /etc/sddm.conf for compatibility

For example, we can find on tumbleweed that the main sddm.conf file is empty, and the configurations are on /usr/lib/sddm/ssdm.conf.d.


$ man sddm.conf

for detailed options information.

On systemd controlled systems, SDDM should work out of the box since it defaults to using systemd-logind for session management.

HiDPI Support

As of version 0.15 HiDPI support was added.

To enable it for X11, add this to the corresponding configuration file


To enable it for Wayland


To change the DPI add -dpi {value} to the Server Arguments. For example to change the DPI for X11 to 192

ServerArguments= -dpi 192


SDDM supports automatic login through its configuration file, for example:


This configuration trigger a KDE Plasma session to be started for user john when the system is booted.


No User Icon

SDDM reads user icon from their ~/.face.icon or FacesDir/username.face.icon. SDDM user must have permissions to read those files.

See also

External links