Bizarre, j'ai refais l'installation de sddm de zéro, mais toujours pas de dossier de conf à part... Après rien n’empêche de le créer à la main, il faut juste indiquer dans sddm.conf où ce situe le chemin de conf.
Cela doit faire partie d'autres paquets.
Je remets mon fichier de conf, car il semble manquer une partie (le copier/coller sous KDE wayland c'est vraiment pas le pied entre du QT->GTK->QT ...).
[Autologin]
# Whether sddm should automatically log back into sessions when they exit
#Relogin=false
# Name of session file for autologin session
#Session=
# Username for autologin session
#User=
[General]
# Enable Qt's automatic high-DPI scaling
#EnableHiDPI=false
# Halt command
#HaltCommand=/usr/bin/systemctl poweroff
# Initial NumLock state. Can be on, off or none.
# If property is set to none, numlock won't be changed
# NOTE: Currently ignored if autologin is enabled.
Numlock=on
# Reboot command
#RebootCommand=/usr/bin/systemctl reboot
[Theme]
# Current theme name
#Current=01-breeze-fedora
# Cursor theme used in the greeter
#CursorTheme=
# Number of users to use as threshold
# above which avatars are disabled
# unless explicitly enabled with EnableAvatars
#DisableAvatarsThreshold=7
# Enable display of custom user avatars
#EnableAvatars=true
# Global directory for user avatars
# The files should be named <username>.face.icon
#FacesDir=/usr/share/sddm/faces
# Theme directory path
#ThemeDir=/usr/share/sddm/themes
[Users]
# Default $PATH for logged in users
#DefaultPath=/usr/local/bin:/usr/bin:/bin
# Comma-separated list of shells.
# Users with these shells as their default won't be listed
#HideShells=
# Comma-separated list of users that should not be listed
#HideUsers=
# Maximum user id for displayed users
#MaximumUid=60000
# Minimum user id for displayed users
#MinimumUid=1000
# Remember the session of the last successfully logged in user
#RememberLastSession=true
# Remember the last successfully logged in user
#RememberLastUser=true
[Wayland]
# Path to a script to execute when starting the desktop session
#SessionCommand=/etc/sddm/wayland-session
# Directory containing available Wayland sessions
#SessionDir=/usr/share/wayland-sessions
# Path to the user session log file
#SessionLogFile=.cache/wayland-errors
[X11]
# Path to a script to execute when starting the display server
#DisplayCommand=/etc/sddm/Xsetup
# Path to a script to execute when stopping the display server
#DisplayStopCommand=/etc/sddm/Xstop
# The lowest virtual terminal number that will be used.
#MinimumVT=1
# Arguments passed to the X server invocation
#ServerArguments=-nolisten tcp
# Path to X server binary
#ServerPath=/usr/bin/X
# Path to a script to execute when starting the desktop session
#SessionCommand=/etc/X11/xinit/Xsession
# Directory containing available X sessions
#SessionDir=/usr/share/xsessions
# Path to the user session log file
#SessionLogFile=.cache/xsession-errors
# Path to the Xauthority file
#UserAuthFile=.Xauthority
# Path to xauth binary
#XauthPath=/usr/bin/xauth
# Path to Xephyr binary
#XephyrPath=/usr/bin/Xephyr