Simple Desktop Display Manager (SDDM)

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https://en.wikipedia.org/wiki/Simple_Desktop_Display_Manager

http://linux.overshoot.tv/etc/sddm.conf
http://linux.overshoot.tv/usr/share/sddm

https://github.com/sddm/sddm

Theming

https://github.com/sddm/sddm/wiki/Theming

sddm-greeter --test --theme /usr/share/sddm/themes/breeze/

Video background

Make sure to add sddm user to the video group.
$ sudo gpasswd -a sddm video

User icons

For user avatars:
- Rename images as username.face.icon and place them in the folder
/usr/share/sddm/faces/

or:
- Edit /etc/sddm.conf and change the FaceDir setting.

or:
put a .face.icon file in your home directory
~/.face.icon

System settings

Simple things can be configured in KDE system settings > Workspace > Startup and shutdown > Login screen (SDDM).

You can change the background. Note that when selecting a new picture as background, the picture will be copied to the theme folder within /usr/share/sddm/themes/. Changing the picture again might leave the old copy of the previous picture in the theme's directory. Pay attention when using videos as background, as it may lead to disk space issues!

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