> > The next system where I'm observing the "mouse pointer jumps to the
> > upper left corner" bug is an ASUS N4L-VM DH mainboard with a C2D
> > T7200 @2GHz,  Intel integrated graphics, and an USB mouse, running
> > OpenSolaris 2010.02 (b117) - but so far only when running the 32-bit
> > kernel.
> 
> I've filed defect 9862 for this
> http://defect.opensolaris.org/bz/show_bug.cgi?id=9862
> 
> I think that there is a problem when using floating point
> code from within a signal handler that has interrupted
> MMX code...

http://defect.opensolaris.org/bz/show_bug.cgi?id=9862#c5

Workaround: disable use of MMX and SSE2 instructions in libpixman-1.so

As user root:

    cp -p /usr/lib/libpixman-1.so.0 /usr/lib/libpixman-1.so.0-orig
    echo 'pixman_have_sse2?w 0xb8 0 0xc300' | mdb -w /usr/lib/libpixman-1.so.0
    echo 'pixman_have_mmx?w 0xb8 0 0xc300' | mdb -w /usr/lib/libpixman-1.so.0

and restart the Xorg server.
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