It turned out a regression from xserver 1.17 on Fedora 22. Fedora 21 Live Media successfully booted into Gnome Session with xserver 1.16. I updated the bug report https://bugzilla.redhat.com/show_bug.cgi?id=1206733 -- Luya Tshimbalanga Graphic & Web Designer E: luya at fedoraproject.org W: http://www.coolest-storm.net