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openSUSE and SLES by default sets to automatically log in user without having to authenticate with username and password. While convenient, this is a security risk as anyone with physical access to your machine could simply boot it up and access your account.

The option is set up during the installation process but if you've missed that or just simply want to change the setting after the fact, you could still do it via YaST or the command line.

Disable auto login in openSUSE and SLES from command line:

  1. Open Terminal application.
  2. Edit /etc/sysconfig/displaymanager using your favorite editor.
    > sudo nano /etc/sysconfig/displaymanager
  3. Search for DISPLAYMANAGER_AUTOLOGIN directive.
    ## Type: string
    ## Default:
    #
    # Define the user whom should get logged in without request. If string
    # is empty, display standard login dialog.
    #
    DISPLAYMANAGER_AUTOLOGIN="user"
  4. Remove the username from the directive.
    DISPLAYMANAGER_AUTOLOGIN=""
  5. Save and exit the editor.

Guide compatibility:

Operating System
openSUSE Tumbleweed
openSUSE Leap 15.1
openSUSE Leap 15.0
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server 12