
Use a solid black background when no background image (via ~/.background-image) is provided. In my case this fixes the really strange behaviour when i3 without a desktop manager starts with the SDDM login screen as background image.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.