If the logs you posted are in order, then X crashes without taking the driver with it OR it doesn't restore your display. In any case, X crashes (too soon) so ctrl-alt-backspace won't do you any good. If you're not running xdm or similar, and return to the console, it should still work, even though you're not seeing it (this used to happed a lot with fglrx)
all I get is a black screen. My monitor seems to shut down (the green LED beside the power button turns orange and blinks) and I see nothing on my screen. In addition, the keyboard is unresponsive and therefore Ctrl-Alt-Backspace seems to have no effect.