SDDM
SDDM, or Simple Desktop Display Manager, is a display manager for X11 and Wayland aiming to be fast, simple and beautiful. It is the recommended display manager for the KDE Plasma and LXQt desktop environments.
This page outlines the basic installation of SDDM, as well as some configuration options.
Installation
Begin by installing the sddm package:
# apk add sddm xorg-server-xephyr
Test the service to see if it launches and works, then enable the service to launch at boot:
# rc-service sddm start
(if it works)
# rc-update add sddm
Configuration
Under KDE, the appearance configuration tool can take care of some settings.
Manual configuration is possible too.
Themes
Themes for SDDM are located in /usr/share/sddm/themes/.
Users can set the theme in /etc/sddm.conf
Contents of /etc/sddm.conf
Many themes can be found on GitHub under the the sddm-theme topic.
Copy a new theme folder to /usr/share/sddm/themes/ and activate it by changing Current= to the name of the folder.
Example
Given a folder containing a theme, my-new-theme.
Test your theme:
$ sddm-greeter --test-mode --theme my-new-theme/
If it looks as desire, copy it to the system themes folder:
# cp -r my-new-theme/ /usr/share/sddm/themes/
Edit the configuration file in /etc:
Contents of /etc/sddm.conf
Face icon / Avatar
The default (fallback) theme, as well as other themes, can show an avatar on the login screen.
This avatar can be set by renaming the desired image to ~/.face.icon