did you check your /etc/sddm.conf and /etc/pam.d/sddm files?
first one yes... and seems to have some configs inside... second one right now and is not empty
cat /etc/sddm.conf [Autologin] Relogin=false User=
[General] HaltCommand= RebootCommand=
[Users] MaximumUid=65000 MinimumUid=1000
cat /etc/pam.d/sddm #%PAM-1.0 auth include common-auth account include common-account password include common-password session required pam_loginuid.so session include common-session
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