ZAxisMapping doesn't work on Mouse

[fis at wiwi.hu-berlin.de]

hi all,

I tried the following config:

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Buttons" "3"
        Option      "Emulate3Buttons" "false"  # (is this still necessary at all?)
        Option      "Protocol" "auto"
        Option      "Device" "/dev/mouse"
        Option      "ZAxisMapping" "Y"
EndSection

Which had the wrong effect: Mouse pointer moves up and down when using
the wheel.  However, the wheel didn't cause any X events visible to
xev(1) when mapped to buttons N1 through N2 resp. N4 as discribed in
the manual.

Is there anything else to try?  Is it correct that the mouse *should*
work (as the "Y" setting does)?

It's a gentoo xorg system (x11-base/xorg-x11 6.7.0-r1); I can put more
hardware specs online if anybody wants to know.

thanks a lot,
matthias