USB mouse not working after unplug-plug in 14.04

Try reloading the mouse driver with

sudo rmmod usbhid
sudo modprobe usbhid

when the mouse is plugged in and not working.
If it helps, try adding usbhid to the end of /etc/modules file and reboot. This is sort of shamanic as it should make no difference, but often helps with unrecognized thumb drives.
If it does not help, you can create a udev rule to reload the mouse module on mouse plugging.

try this

echo "on" | sudo tee /sys/bus/usb/devices/usb*/power/control

then reboot. it works for me.