>>>>> "MS" == Matthias Scheler writes:

 >> With my PS/2 Logitech I use ZAxisMapping 4 5.

 MS> So it seems that the USB mouse driver flips the directions. I'll submit
 MS> a PR about that problem.

	please, don't. here is a piece of my /etc/XF86Config:

Section "Pointer"
 	Protocol	"wsmouse"
	Device		"/dev/wsmouse0"
	ZAxisMapping	4 5	


	i have the same Logitech USB mouse as you and have no problems at
all. here is the output from `dmesg':

....

ums0 at uhub0 port 1 configuration 1 interface 0
ums0: Logitech N48, rev 1.00/4.01, addr 2, iclass 3/1
ums0: 3 buttons and Z dir.
wsmouse0 at ums0

....