Comment # 6 on bug 1176212 from Rainer Klier

hi,

as workaround i edited file /usr/lib/sddm/sddm.conf.d/00-general.conf, and
changed the paths from /etc/X11/xdm/Xsession and /etc/X11/xdm/Xsetup to
/usr/etc/X11/xdm/Xsession and /usr/etc/X11/xdm/Xsetup.