(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?