Here is kernel message: [ 2.939251] usb 1-1: new high-speed USB device number 2 using ehci-pci [ 18.490987] usb 1-1: device not accepting address 2, error -110 [ 18.595095] usb 1-1: new high-speed USB device number 3 using ehci-pci [ 34.182233] usb 1-1: device not accepting address 3, error -110 [ 34.286352] usb 1-1: new high-speed USB device number 4 using ehci-pci [ 44.744589] usb 1-1: device not accepting address 4, error -110 [ 44.849590] usb 1-1: new high-speed USB device number 5 using ehci-pci [ 55.307858] usb 1-1: device not accepting address 5, error -110 [ 55.310239] hub 1-0:1.0: unable to enumerate USB device on port 1 Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html