Believe it or not
yesterday I had to fight hard with my box and have to consider
X as crashed completely. The situation was as follows.
The system is mainly slink. (Nevertheless I think the posting to
debian-devel is apropriate)
I worked under X (fvwm2).
After starting an e2fsck of the parallel-port zipdrive as root at
the console, my mouse cursor moved to the top right corner of the
screen. I was able to move the mouse to any other position, but
it immediately returned to the top right corner.
The keyboard was disabled. No input in the active window nor
<Ctrl>-<Alt>-<Backspace> to shut X down worked.
Switching to console was impossible, too.
I looked in over the network and did step by step killing all
X clients. (The e2fsck process was finished, but the situation
has not changed.)
After killing fvwm2 (xinit ended as well) all worked like before.
After startx I was able to work as usual.
I post it here because I detected strange interferences between
zip drive and X not the first time. This was just the hardest
case which would me hav let press power-off if I weren't connected
with another box.
Could someone imagine a reason for that behaviour. Oh, yes, for
the sake of interest, the kernel is 2.2.4.