3. Disable the user list: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Desktop_Migration_and_Administration_Guide/customizing-login-screen.html
I mentioned two other workarounds myself. I prefer to wait for the upstream bug to be solved: https://bugzilla.redhat.com/show_bug.cgi?id=1184802
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