https://bugs.freedesktop.org/show_bug.cgi?id=62889
--- Comment #11 from Michel Dänzer michel@daenzer.net --- (In reply to comment #8)
It seems like Gnome 3.6 won't work unless color tiling is enabled. I double checked the gnome session logs and don't see the previously mentioned error anymore.. just a blank desktop wallpaper across both monitors.
Weird. GNOME 3.6 was and 3.8 still is working fine for me with ColorTiling disabled (on a 7770), and I'm not sure how this could be directly related. Is there anything in dmesg about GPU lockups, or is gnome-shell getting stuck somehwere, or something like that?