In t7, after installing mate-session-1.6.1-alt1_3 , /etc/X11/wmsession.d/02Mate becomes the preferred (default) session started by "runwm default", but it is not usable, probably due to: янв 20 14:11:07 ovicaa.localdomain mate-session[4911]: WARNING: Unable to find provider 'caja' of required component 'filemanager' янв 20 14:11:07 ovicaa.localdomain mate-session[4911]: WARNING: Unable to find provider 'marco' of required component 'windowmanager' (Actually, I didn't want to install mate-session and make it the default one. It was a consequence of installing mate-document-viewer. I use Simply Linux with Xfce. Workaround: install atril-gtk instead of mate-document-viewer.) BTW, xfce4-session does require the corresponding window manager, perhaps, mate-session should require its WM, too: # rpm -q xfce4-session --requires | fgrep wm wm-common-freedesktop /etc/X11/wmsession.d xfwm4 #