In a kernel 2.6 it is not enough to compile the USB drivers as a module for using an USB mouse. It will not work. Reproducible: Always Steps to Reproduce: 1. 2. 3. Actual Results: The problem is that the PS/2 mouse driver is compiled into the kernel unconditionally, so the PS/2 driver is always loaded at boot. To solve the problem it is neccessary to compile the USB drivers into the kernel, too. It is written in the Documentation of kernel 2.6 in i386/usb-legacy-support.txt. It would be fine if you can add this to the Desktop Configuration Guide
Fixed in CVS. Thanks for reporting!