I have a USB Logitech cordless trackball with a wheel.
It works in 2.5.59, but not in 2.4.21-pre4.
The kernels are setup the exact same. When my system boots up, I see a 
message about the USB Logitech Receiver, but the trackball doesn't work 
in the console or in KDE. It works with RedHat's 2.4.18-19.8.0 kernel, 
but only in KDE (Odd), so I am guessing that they may have partially 
backported a patch from the beta kernel.

Attached is the latest config that I use for 2.4.21-pre4.
I have tried including the USB and Input devices in the kernel as well, 
but with no luck.
Any comments or suggestions?

Regards,
David