I used to have this problem, but it always turned out to be a graphics card issue. With certain operations, I could reliably kill my xserver on my machine running with an ATI card. But my machine with Intel graphics never had a problem.
Cheers, Walter Landry wlan...@caltech.edu -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org