From Fedora Project Wiki
Switching from KDM to LightDM login manager
As it is possible to compile kde-workspace without KDM using a cmake parameter [1], we can replace the default KDE login manager (KDM) with others, namely LightDM that has improved its KDE support dramatically lately.
Pro:
- Smaller code base
- Better performance (according to their presentation, my experince so far is not that great - mbriza)
- Simpler API for creating greeters
- Powermanagement is present
- Multi-head support is better - Prompt is displayed on the screen where the mouse cursor is
Con:
- Switching users in KDE is not possible. [2]
What needs to be done:
- Add the conditional KDM inclusion parameter to kde-workspace
- Edit kde-settings not to ship KDM settings
Links
- http://www.freedesktop.org/wiki/Software/LightDM official web
- http://www.sharpley.org.uk/node contains release info and interesting discussions (unfortunately there are no tags to filter the articles)
- http://lists.kde.org/?l=kde-core-devel&m=130799230315640 a quite lenghty thread comparing KDM to LightDM in the KDE-core-devel mailing list