In openSUSE and SUSE Linux systems, changing variables for user autologin 
in displaymanagers' configuarations (sddm, kdm, gdm...) will not take effect.
In openSUSE and SUSE Linux systems, instead, display managers reads 
DISPLAYMANAGER_AUTOLOGIN variable from /etc/sysconfig/displaymanager 
configuration file.

--- a/src/modules/displaymanager/displaymanager.conf
+++ b/src/modules/displaymanager/displaymanager.conf
@@ -16,14 +16,7 @@
 # is attempted. You can also list "sysconfig" in this list instead.
 #
 displaymanagers:
-  - slim
-  - sddm
-  - lightdm
-  - gdm
-  - mdm
-  - lxdm
-  - kdm
-  - greetd
+  - sysconfig
 
 # Enable the following settings to force a desktop environment
 # in your displaymanager configuration file. This will attempt
@@ -59,4 +52,4 @@ basicSetup: false
 # The preferred way to pick sysconfig is to just list it in the
 # *displaymanagers* list (as the only one).
 #
-sysconfigSetup: false
+sysconfigSetup: true