Restart X server:
sudo restart mdm
Restart USB:
# lspci | grep -i usb
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03)
00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller (rev 03)
printf "0000:00:14.0" | tee /sys/bus/pci/drivers/xhci_hcd/unbind
printf "0000:00:14.0" | tee /sys/bus/pci/drivers/xhci_hcd/bind