Hi, Is there some documentation for the XDG_SESSION_TYPE environmental variable? So far the only think I managed to find is the pam_systemd manual page.
I have observed that multiple display managers (at least GDM, SDDM and LightDM) set this variable and some applications use it to determine the type of current session. Also the Qt toolkit uses it to decide if it should prioritize the X11 or Wayland backend. IMHO that usage makes sense, because in some situations both X11 and Wayland displays are available and the toolkit needs to know which one is preferred. If it would unconditionally prefer X11, it may end up using Xwayland when started from Wayland session. If it would unconditionally prefer Wayland, it may end up connecting to a completely unrelated "wayland-0" display when started from X11 session. GTK currently unconditionally prefer Wayland and I have hit a bug when GTK applications started from X11 session start in unrelated Wayland session. So I tried to advocate the use of this variable for backend selection in GTK: https://gitlab.gnome.org/GNOME/gtk/issues/1224 However the authors are reluctant to use the XDG_SESSION_TYPE variable without seeing further documentation or some discussion on where it came from. Does anything like that exist? If not, is there chance the variable will be "standardized"? Best regards, Michal Srb _______________________________________________ xdg mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/xdg
