I use MS Inteli Mouse. And it does not want to work without usbmouse module if I plug it in into usb (without usb->ps/2 connector) Here my xorg.conf mouse section: Section "InputDevice" Identifier "mouse" Driver "evdev" Option "ButtonNumber" "5" Option "Name" "Autodetection" Option "ZAxisMapping" "4 5" EndSection I try now rmmod usbmouse on running X - mouse dissapeared modprobe usbmouse makes mouse work again