Never mind, I plugged the adapter into a windows machine once more (another one) and now it acts exactly like it's plugged into my linux laptop, so I guess it's actually broken. I will send it back for repair.
Thanks for your effort and I apologise for being a pain ;-) - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
