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There is a trick I do when debugging USB connected devices. I save the output of lsusb -vvv to a file with the device connected and without the device connected. Then diff the two files to see the details of the device, if there is no difference then the USB device is not registered by the OS at all. The process is:

With the device unplugged:

lsusb -vvv > unconnected.txt

Then plug the device in and run:

lsusb -vvv > connected.txt
diff unconnected.txt connected.txt

Hope this helps.