The above should work for most systems. The next section is Pointer which specifies parameters for the mouse device. The only options that you should concern yourself with now are Protocol and Device . Note that older Logitech mice should use Logitech , but newer Logitech mice use either Microsoft or Mouseman protocols. This is a case in which the protocol doesn't necessarily have anything to do with the make of the mouse.
Device specifies the device file where the mouse can be accessed.
At any rate, be sure that the device file listed in Device exists. The next section is Monitor , which specifies the characteristics of your monitor. As with other sections in the XF86Config file, there may be more than one Monitor section. This is useful if you have multiple monitors connected to a system, or use the same XF86Config file under multiple hardware configurations. In general, though, you will need a single Monitor section.