Switching to tty does not display anything (no signal)

I think I will respectfully disagree.
After searching and reading a lot of relevant technical info and bug reports, it is fairly possible (probable) it’s a LightDM and/or Cinnamon bug/issue.

I suggest you install and enable/use SDDM and Plasma. Anyway, the looks you prefer can be achieved easily, even Plasma has a good GTK compatibility and appearance.