Please,
could you be more explicit? 
I have had to put:
....
Section "InputDevice"
    Identifier     "Configured Mouse"
    Driver         "mouse"
    Option         "CorePointer" "true"
    Option         "Device" "/dev/psaux"
    Option         "Protocol" "ImPS/2"
    Option         "ZAxisMapping" "4 5"
    Option         "SendCoreEvents" "false"
EndSection
SendCoreEvents to false because if I commented the line or set it to true, the 
mouse was buggy. And I didn't understand the :
> Replacing SendCoreEvents by CorePointer fixed my mouse.
regards,
Leo
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Linux User 152692
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