According to Robert Nestor:
>
>Does anyone have another idea about what this might be caused by?
>

Have you tried just running X from the command line using the startx
command rather than using xdm?  This would eliminate any suspicion
about the xdm vs getty fight - if you still get lockups then there is
a different problem but if the lockups go away then it really does
point at something else snatching the keyboard away from X.

-- 
Brett Lymn, Computer Systems Administrator, British Aerospace Australia
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  What do you get when you cross a cantaloup with a dog?        Melancholy :-P