Re: http://cdimage.debian.org/lastmin.html

[Francesco Potorti` <pot@gnu.org>]

   device=/dev/psaux
   responsiveness=
   type=imps2
   append="-l \"a-zA-Z0-9_.:~/\300-\326\330-\366\370-\377\""
   
   It works with every mouse I have tryed (5 different mouses) and you
   don't require to stop gpm before starting X.

I use this, which also should always work:

device=/dev/trackball
responsiveness=15
type=ps2
append="-M -r 20 -l \"a-zA-Z0-9_.:~/\300-\326\330-\366\370-\377\""
        ^^

And then, in /etc/X11/XF86Config:

# useful, not strictly necessary
Section "ServerFlags"
   AllowMouseOpenFail
EndSection

Section "Pointer"
   Protocol        "MouseSystems"	# here is
   Device          "/dev/gpmdata"	# the trick
   BaudRate        1200
   Resolution      200
   Buttons         3
   Emulate3Buttons
EndSection