I've noted that the intel graphics driver causes the HW cursor to jump
when it is detecting modes (as provoked by Xrandr).

Various other bugs in the GNOME stack (at various times in the Jaunty
cycle), have exaggerated the number of XRandR probes in a horrible
interaction between g-s-d and the backlight brightness fading code.

Lots of expensive XRandR probes is a more serious bug, but I suspect the
jumping cursor symptom is some artifact of the registers saved /
restored during the load-detection on various outputs.

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Cursor jumps from time to time
https://bugs.launchpad.net/bugs/314390
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