Package: sddm Version: 0.12.0-5SDDM completely ignores the system keyboard configuration and uses "us" layout. With the default "breeze" theme, it is not possible to choose any keyboard layout. "Maui" theme lets me choose the layout, but the only choice is "us" layout.
The consoles have the correct "fr" layout.I chose French layout when configuring console-setup, keyboard-configuration.
My /etc/default/keyboard contains: XKBMODEL="pc105" XKBLAYOUT="fr"