When you connect your USB device, the kernel posts messages about what device(s) and controller(s) are connecting, and the associated device drivers assigned, if any. This output is in (up to) five places:
1) On your console, in white text on blue background, which you would see if you were not running X Windows at the time. From i386/amd64 architectures, you can switch to the console with Alt+Ctrl+F1, and back to your X Windows with Alt+Ctrl+F5.
2) In your dmesg(8).
3) In /var/log/messages.
4) In /var/run/dmesg.boot.
5) In an xconsole(1) window, if you are using that tool.
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From that, if you cannot determine what device(s) are available when you connect your USB device, please post the contents of /var/run/dmesg.boot here.
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