OK, this was my fault :-)
In 2.5.X, psmouse_initialize is actually setting the resolution, etc,
whereas 2.4.X is just using the mouse's power on default. Adding:
Option "Resolution" "200"
to my X config file, seems to initialise the mouse in a similar way,
and it works fine.
Never noticed this with any other PS/2 mouse, though. Maybe this one
just has an unusual power-on default setting?
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