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(a)fedoraproject.org
W:
http://www.coolest-storm.net