Hi Clive
I can only hazzard guesses.
- Is your scanner switched on BEFORE you start your computer?
-> should be because the module may not be loaded on the fly. Did you try a modprobe?
- Could be that the hub does not provide enough power for the scanner
-> kinda unlikely, though because the scanner is powered but perhaps this influences the signal strenght. As I said, unlikely
- hub prioritisation
-> Have you tried disconnecting the other devices from the hub to see if the scanner works then? I mean a hub doesn't deal with multiple requests at a time (-> not a switch), so perhaps your external hard disk causes it never to get any sufficient transfer time? I am not sure how much this can be an issue, though it is worth trying.
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