I have a 4k/uhd display and have set gnome scaling factor to 2 for my username and also the lightdm user so that greeter login screen also is "hidpi" enabled. I have greeter background set to a default wallpaper and my user account (gala) wallpaper is solid colour.
Now when I login and the transition from greeter to gala there is a brief flash where the wallpaper is tiled 2x2 (4x) like a grid, it briefly flashes that before switching to solid background and loading desktop.
I was trying to look through the greeter and gala code but couldn't figure out where this issue might be occurring (or if it's a Xorg config issue)... any ideas?