Someone has probably already mentioned this phenomenon,
but here is what I did:
I booted Slackware 12 with kernel 126.96.36.199
I ran the X server for the first time, got the VESA mode.
Used right-click & exit to log out of Xfce.
It just stopped.
Typed Control-Alt-Fn a few times trying to get to other consoles, to
Note that the kernel doesn't crash because it still responds to
the power button. This is an X problem, I believe.