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  Linux HOWTOs -> XFree 3.x              
XFree 3.x

4. XFree 3.x

In XFree 3.x, additional pointing devices, like mice or tablets, are defined through the use of an Xinput section. The primary mouse is defined as usual:

Section "Pointer"
    Protocol    "PS/2"
    Device      "/dev/mouse"
In the case above, it's a regular three-button PS/2 mouse, which works for the trackpoint as well. Now, for the USB mouse:
    Section "Xinput"
  SubSection "Mouse"
    DeviceName "USB Mice"
    Protocol "IMPS/2"
    ZAxisMapping 4 5
    Port "/dev/input/mice"
My mouse is a wheel mouse, thus the protocol is IMPS/2. ZAxisMapping line is also needed for the wheel to work. I also want the mouse to always work alongside the other one, and this is achieved through the AlwaysCore option. If. for example, this was a serial mouse, the Port would read "/dev/ttyS0" for COM1.

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