Interesting, had it been inactive for a while when this happened ?
Yes, but dead with flashing lights not dead dead
I've seen xscreensaver lock up Victoria's laptop to the point
I had to
ssh in and kill it twice now. I've not managed to pin down the exact
screensaver thats causing this. I can't even point the finger at DRI
as its running unaccelerated 3d.
Switch to the 2D to unaccelerated and repeat the experiment. Good candidates
will be accelerated arc support (because only X screensaver uses it) and
similar things