Comment # 2 on bug 1125637 from Michael Hirmke

(In reply to Wolfgang Bauer from comment #1)
> And why is that a problem?
> 
> /usr/share/sddm/scripts/Xsetup is not used at all by default (the shipped
> default config explicitly sets "DisplayCommand=/etc/X11/xdm/Xsetup"), and if
> you reconfigure sddm you can use an arbitrary location/filename anyway.

not here - in my /etc/sddm.conf no DisplayCommand line existed by default.
In contrary the file was nearly empty for a longer time.

But if /etc/X11/xdm/Xsetup is the way to go, I can use this one, of course.
To my understanding this file was for xdm only, though. Besides that it uses
the deprecated /etc/sysconfig/displaymanager.