The cause of this problem on my system seems to be when dragging
(resizing) a window. X then seems to hang, the pointer gets jumpy
I should also have added that the mouse cursor image "sticks" to the
diagonal arrow - it doesn't become the normal arrow/pointer again.
I have just booted up in the debug kernel and managed to re-hang X in no
time at all, using the method described above... :-/
The only error message I can find, both in dmesg and messages, is this:
kernel: ACPI Error (tbfadt-0453): 32/64X address mismatch in
"Pm2ControlBlock":  , using 64X 
The timestamp of this log entry roughly corresponds to the occurrence of
the hang. But whether this has any bearing on the problem, I cannot
say. I would guess that ACPI has some interaction with mouse events
through X (e.g. polling), but judging by the position of this log entry,
it appears to be during boot time.
Any advice relating to debugging gratefully received...
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