Comment # 2 on bug 1030606 from Wolfgang Bauer

And just to avoid a misunderstanding:
(In reply to Oliver Kurz from comment #0)
> On an openSUSE Leap 42.2 (x86_64) with sddm 0.13.0-8.1 when reaching sddm
> login, selecting text terminal, logging in, `systemctl status sddm` reports
> sddm to be inactive.

In openSUSE we use a generic display-manager.service that starts the DM
specified in /etc/sysconfig/displaymanager.
So it is normal and to be expected that sddm.service is inactive.

Unless you enabled it manually via "systemctl enable sddm.service".
I suppose that's what you mean with "boot system with sddm enabled", do you?

But IIRC, you need to disable display-manager.service before for this to work.
"systemctl enable sddm.service" will change the link
/etc/systemd/system/display-manager.service to point to sddm.service instead,
but there may still be a xdm.service too (that points to the real
display-manager.service and cause display-manager.service to be started).
Maybe that's the problem you experienced?

What's the exact output of "systemctl status sddm.service" and "systemctl
status display-manager.service"?