Package: systemd Version: 215-7 Severity: serious
We are starting to see multiple bug reports about several display managers started at boot. In addition, if /etc/X11/default-display-manager if changed manually, we can end up in a situation where no display manager is started at all on system boot.
This is due to the fact that some display manager are using init scripts only, and the dynamic converted version of this unit is then started. Some systemd units as well are not checking /etc/X11/default-display-manager (see http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=748668 for more details).
One solution would be to convert all dms to ship systemd services with the same template and /etc/X11/default-display-manager check. One side-effect is that if you install multiple dms, you will always end up with a Status: degraded in systemctl.
A less invasive solution is to create and patch systemd generators to dynamically (at each boot) mask in memory all sysv-init scripts-only services that don't match /etc/X11/default-display-manager, and redirect the default configured dm to the selected systemd or sysv-init unit.
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