In article <E0yQzyI-0001q7-00@taurus.cus.cam.ac.uk>,
	prlw1@cam.ac.uk (Patrick Welche) writes:
> A couple of times now I have been giving my PC a bit of number
> crunching to do, while using it under X, and all of a sudden it is as
> if my keyboard was not connected.

Check "/etc/ttys" for a "getty" using the same tty as "xdm".

-- 
Matthias Scheler                                http://home.owl.de/~tron/