I installed Antergos last week, picking gnome as my DE. After installing, I installed the nvidia drivers and ran updates. I think the lock screen worked initially on install, but after the updates my lock screen is white and I can’t log back in.
I am running LightDM, the default that comes with the installer.
A few possible relevant details: The white screen was super low res. After adjusting the default Grub resolution, the lock screen followed that updated resolution.