/dev/mouse: not supported by device

[Davide Anchisi]

I everybody,

I tryed to run XFree after configuring with xf86config. After a while
that I typed startx (and the monitor came black) there is a return to
comand line and appeared the message:

    Fatal server error:
    Cannot open mouse (Operation not supported by device)

So I tryed gpm, with a similar resul:
    gpm: /dev/mouse: not supported by device
And even gpm -m /dev/ttyS0 is not better

What's the problem? What should I do?

Thanks to any help,

    Davide