Fourth button of Logitech MouseMan Wheel?

[Remco Blaakmeer <remco-blaakmeer@quicknet.nl>]

Hi,

I just bought a Logitech Cordless MouseMan Wheel. Previously, I had a
Logitech Wheel Mouse. Using the same setup in X, I can use three buttons
and the wheel just like with the Wheel Mouse. But how can I use the fourth
(thumb) button on my new mouse? I have tried several things, but to no
avail.

Here's part of my current XF86Config:

Section "Pointer"
    Protocol     "IMPS/2"
    Device       "/dev/psaux"
    Buttons      6
    Resolution   400
    ZAxisMapping 4 5
EndSection

With this setup, I tried to run the xev program to see what the mouse
does. The wheel generates events for buttons 4 and 5, but the thumb button
generates no events at all.

Can anybody please help?

Remco
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