KDE and systemd
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logind depends on systemd.
The bug below shows that KDE developers fully expect users to use logind and systemd:
Bug 360489 - kscreenlocker suggests running "loginctl unlock-sessions" even though I don't use systemd
A reply from a KDE developer says that they won't fix this for users not using systemd:
Martin Gräßlin 2016-03-14 :
There is nothing wrong there. It's a fallback for the case that something is seriously broken. We improved that experience from black screen to something which works on 99 % of our users systems. There is no Plasma developer who doesn't use logind, so it's just not possible for us to support anything else. We expect the non-logind users to add code for this (which could also be a dummy loginctl binary which just works the same way). (Similar code was contributed to support consolekit in kscreenlocker).
From our side this is a clear wontfix or more a cantfix. Please do not expect us to go an extramile to support a corner case of the corner case.
elogind seems to appear as an alternative to logind.
SDDM seems to require systemd for error logging to be fully functional.
KDE and systemd use flag
List of gentoo packages having a systemd use flag:
Among which, there are some packages related to KDE: