Following a standard Knoppix 3.3 hard disk install the wheel on my Logitech Cordless MouseMan scrolls perfectly, but when I click it, it produces the same behaviour as the button that is under my thumb. I would like the "thumb button" to be recognised as a different button. I have checked on the web and tried the various different setups, but nothing changes.

The relevant section of my XF86config file is:

Section "InputDevice"
Identifier "Logitech Cordless Mouseman Wheel"
Driver "mouse"
Option "Device" "/dev/mouse"
Option "Protocol" "MouseManPlusPS/2"
Option "Emulate3Buttons" "no"
Option "Buttons" "6"
Option "ZAxisMapping" "5 6"
EndSection
And after restarting X, I type into a console window:

xmodmap -e "pointer = 1 2 6 3 5 4"
Which produces the following error:

xmodmap: commandline:0: bad number of buttons, must have 5 instead of 6
xmodmap: 1 error encountered, aborting.
Any suggestions?

Thanks,

Tim