HP Omnibook 800 CT integrated mouse problem

QNX 6.3 install like a charm on the HP Omnibook 800 ct and runs flawlessly,
except for one minor problem: the integrated mouse, even though properly
recognized as a PS/2 mouse on IRQ 12, refuses to make the mouse pointer move
in the graphical environment.

I did some reading on the QNX website about the inputtrap, but so far I was
not able to resolve the problem. Suggestions would be welcome.