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<p><b>Debug info<br>
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<p><b>$ lsusb</b><br>
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate
Matching Hub<br>
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub<br>
Bus 001 Device 005: ID 04a9:1073 Canon, Inc. I550 Printer<br>
Bus 001 Device 004: ID 093a:2510 Pixart Imaging, Inc. Optical
Mouse<br>
Bus 001 Device 003: ID 046d:089d Logitech, Inc. QuickCam E2500
series<br>
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate
Matching Hub<br>
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub<br>
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub<br>
Bus 003 Device 002: ID 04a9:190f Canon, Inc. <br>
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub<br>
</p>
<p><b>$ lsusb -t</b><b><br>
</b>/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p,
5000M<br>
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M<br>
|__ Port 3: Dev 2, If 0, Class=Vendor Specific Class, Driver=,
480M<br>
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M<br>
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M<br>
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M<br>
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M<br>
|__ Port 3: Dev 3, If 0, Class=Vendor Specific Class,
Driver=gspca_zc3xx, 12M<br>
|__ Port 3: Dev 3, If 1, Class=Audio,
Driver=snd-usb-audio, 12M<br>
|__ Port 3: Dev 3, If 2, Class=Audio,
Driver=snd-usb-audio, 12M<br>
|__ Port 4: Dev 4, If 0, Class=Human Interface Device,
Driver=usbhid, 1.5M<br>
|__ Port 6: Dev 5, If 0, Class=Printer, Driver=usblp, 12M<br>
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