Session and seat management is not necessary for every setup, but it can be used to safely create temporary runtime directories, provide access to hardware devices and multi-seat capabilities, and control system shutdown.
D-Bus is an IPC (inter-process communication) mechanism used by userspace software in Linux. D-Bus can provide a system bus and/or a session bus, the latter being specific to a user session.
- To provide a system bus, you should enable the
dbusservice. This might require a system reboot to work properly.
- To provide a session bus, you can start a given program (usually a window manager or interactive shell) with dbus-run-session(1). Most desktop environments, if launched through an adequate display manager, will launch a D-Bus session themselves.
Note that some software assumes the presence of a system bus, while other software assumes the presence of a session bus.
elogind(8) manages user logins and system
power, as a standalone version of
systemd-logind. elogind provides necessary
features for most desktop environments and Wayland compositors. It can also be
one of the mechanisms for rootless Xorg.
Please read the "Power Management" section for things to consider before installing elogind.
To make use of its features, install the
elogind package and make sure the
system D-Bus is enabled. You might need to log out and in again.
If you're having any issues with elogind, enable its service, as waiting for a D-Bus activation can lead to issues.