Here is some additional info...
/var/log/messages at boot:
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May 17 11:59:11 avalon kernel: usb.c: registered new driver usbdevfs
May 17 11:59:11 avalon kernel: usb.c: registered new driver hub
May 17 11:59:11 avalon kernel: usb-uhci.c: $Revision: 1.275 $ time 14:22:01 Mar 27 2002
May 17 11:59:11 avalon kernel: usb-uhci.c: High bandwidth mode enabled
May 17 11:59:11 avalon kernel: usb-uhci.c: USB UHCI at I/O 0xdc00, IRQ 11
May 17 11:59:11 avalon kernel: usb-uhci.c: Detected 2 ports
May 17 11:59:11 avalon kernel: usb.c: new USB bus registered, assigned bus number 1
May 17 11:59:11 avalon kernel: hub.c: USB hub found
May 17 11:59:11 avalon kernel: hub.c: 2 ports detected
May 17 11:59:11 avalon kernel: usb-uhci.c: USB UHCI at I/O 0xe000, IRQ 11
May 17 11:59:11 avalon kernel: usb-uhci.c: Detected 2 ports
May 17 11:59:11 avalon kernel: usb.c: new USB bus registered, assigned bus number 2
May 17 11:59:11 avalon kernel: hub.c: USB hub found
May 17 11:59:11 avalon kernel: hub.c: 2 ports detected
May 17 11:59:11 avalon kernel: usb-uhci.c: v1.275:USB Universal Host Controller Interface driver
May 17 11:59:11 avalon kernel: hub.c: USB new device connect on bus1/1, assigned device number 2
May 17 11:59:11 avalon kernel: usb.c: USB device 2 (vend/prod 0x45e/0x25) is not claimed by any active driver.
May 17 11:59:11 avalon kernel: usb-uhci.c: ENXIO 84000280, flags 0, urb c37bf440, burb c37bf340
May 17 11:59:11 avalon kernel: usb.c: error getting string descriptor 0 (error=-6)
May 17 11:59:11 avalon kernel: usb-uhci.c: ENXIO 84000280, flags 0, urb c37bf440, burb c37bf340
May 17 11:59:11 avalon kernel: usb.c: error getting string descriptor 0 (error=-6)
May 17 11:59:11 avalon kernel: usb-uhci.c: ENXIO 84000280, flags 0, urb c37bf440, burb c37bf340
May 17 11:59:11 avalon kernel: usb.c: error getting string descriptor 0 (error=-6)
May 17 11:59:11 avalon kernel: usb-uhci.c: ENXIO 84000280, flags 0, urb c37bf440, burb c37bf340
May 17 11:59:11 avalon kernel: usb.c: error getting string descriptor 0 (error=-6)
May 17 11:59:11 avalon kernel: usb-uhci.c: ENXIO 84000280, flags 0, urb c37bf440, burb c37bf340
May 17 11:59:11 avalon kernel: usb.c: error getting string descriptor 0 (error=-6)
May 17 11:59:11 avalon kernel: usb-uhci.c: ENXIO 84000280, flags 0, urb c37bf440, burb c37bf340
May 17 11:59:11 avalon kernel: usb.c: error getting string descriptor 0 (error=-6)
May 17 11:59:11 avalon kernel: usb-uhci.c: ENXIO 84000280, flags 0, urb c37bf440, burb c37bf340
May 17 11:59:11 avalon kernel: usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 9 ret -6
May 17 11:59:11 avalon kernel: mice: PS/2 mouse device common for all mice
/var/log/messages when mouse replugged:
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May 17 11:59:57 avalon kernel: hub.c: USB new device connect on bus1/1, assigned device number 3
May 17 11:59:57 avalon kernel: usb.c: USB device 3 (vend/prod 0x45e/0x25) is not claimed by any active driver.
May 17 11:59:57 avalon kernel: usb.c: registered new driver hiddev
May 17 11:59:57 avalon kernel: usb.c: registered new driver hid
May 17 11:59:57 avalon kernel: usb-uhci.c: interrupt, status 3, frame# 437
May 17 11:59:57 avalon insmod: Using /lib/modules/2.4.18-4GB/kernel/drivers/usb/hid.o
May 17 11:59:57 avalon insmod: Symbol version prefix ''
May 17 11:59:57 avalon kernel: input0: USB HID v1.00 Mouse [Microsoft Microsoft IntelliMouse ® with IntelliEye] on usb1:3.0
May 17 11:59:57 avalon kernel: hid-core.c: v1.8.1 Andreas Gal, Vojtech Pavlik