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I recently encountered an issue with the Deepin lightdm greeter that I'd like to elaborate an answer on, as finding it is a little obscure and this would, hopefully, help anyone searching around.

The same issue is found on this post. I'd comment, but I don't have 50 rep!

When using the proprietary Nvidia drivers, you may come across an issue where your login screen / lock screen come up as black or white, maybe with an icon. This occurred for me with the deepin lightdm greeter. As an initial workaround, I switched over to the gnome greeter.

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There appear to be two resolutions to this problem. The first is documented in the answer linked above. The second is a little more obscure, but actually resolved my issue.

The first solution is to append nvidia-drm.modeset=1 to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub (sudo nano /etc/default/grub). Then save and sudo update-grub, ending with a reboot (shutdown -r now).

This, like for a few others on that post, did not work for me.

The second solution and & the resolution to my problem was instead scooped from antechdesigns who directs you to check for the directory /var/cache/image-blur/ for a blank image (mine was a png). Remove it from this directory. Immediately, I was able to lock my screen and no longer see a white abyss staring me back in the face!

Hope this helps someone as stuck as I was!

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