https://bugs.freedesktop.org/show_bug.cgi?id=43835
--- Comment #10 from Camaleón noelamac@gmail.com 2011-12-15 13:28:13 PST --- (In reply to comment #8)
Does the system hang if you remove the NoAccel option but don't load gnome-shell?
Yes, the user has reported that by removing that option from "xorg.conf" file and login into gnome fallback mode (now "gnome classical") the system hung.