I am also affected by this problem. I just replaced a POS wheel mouse
that moved nicely with a Logitech M705 laser mouse. The laser sensor
naturally reports movement data a lot more often per inch of real mouse
movement than the wheel mouse did. The mouse driver should have taken
that into account when deciding how to translate mouse movement data
into cursor movement.

FYI I have tried turning mouse sensitivity and acceleration down all the
way in gnome-mouse-properties. This is not sufficient to make the mouse
comfortable usable. It moves FAR too fast for my liking. I've also tried
'xset mouse 0 0' (which I know should have done the same thing) just to
be sure g-m-p was doing what I thought it was. No change.

I think it might be a shortcoming in the evdev driver: is the driver
even aware of the resolution of your optical mouse's sensor? If not then
a bug should be filed against evdev. If it is, maybe there needs to be
quirk data for my mouse model.

-- 
Slowest mouse speed still to fast for high DPI mouse
https://bugs.launchpad.net/bugs/480746
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