SUMMARY Setting auto-login for a user appears to work, but it does not alter the config file. Hence auto-login does not work, and returning to user-manager show it as unset for the user. STEPS TO REPRODUCE 1. Set auto-login for a user 2. Authorise this for the user, then to alter the sddm config. It appears to apply. 3. Try to auto-login, or reload user-manager. Observed that the setting did not apply. OBSERVED RESULT Config remains unaltered EXPECTED RESULT Autologin enabled for that user SOFTWARE/OS VERSIONS Linux/KDE Plasma: Neon KDE Plasma Version: 5.17.1 KDE Frameworks Version: 5.63 Qt Version: 5.13.1 ADDITIONAL INFORMATION I should also note that sddm-config KCM can successfully set the config file, if you use that to enable auto-login.
I can confirm this behavior on two machines with KDE neon 5.17.1 installed - in my case I cannot switch off auto-login for a user in "user-manager": 1. Issue this command from Konsole: $ kcmshell5 user_manager 2. Unset auto-login for a user 3. After entering password (ID: org.freedesktop.accounts.user-administration) Konsole throws this: QDBusArgument: read from a write-only object QDBusArgument: read from a write-only object QDBusArgument: read from a write-only object 4. After entering password (ID: org.kde.kcontrol.kcmsddm.save) Konsole throws this: Warning from helper: QFSFileEngine::open: No file name specified Warning from helper: Empty filename passed to function 5. Close and open "user-manager" - setting is not saved.
*** This bug has been marked as a duplicate of bug 342722 ***