usb device not detecting

[Vishnu P <vishnucta@xxxxxxxxx>]

I am using Dell XPS 15 laptop......all my ports are usb 3.0 
port........it doesnot detect any usb device........i tried to add 
kernel parameters xhci.enable=1......but still the problem persist....
i hope that you will provide me a suitable solution for the above problem........my lsusb o/p is:


Bus 002 Device 003: ID 0421:0187 Nokia Mobile Phones 
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 0408:2fb1 Quanta Computer, Inc. 
Bus 001 Device 003: ID 0a5c:21b2 Broadcom Corp. 
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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