Eh, I have that chip too. I don't know if it's got anything to do with linux (my understanding is that the chip asks to be polled over USB every millisecond, and there are only 1000 frames that can go over the USB bus by second, so that device won't work if it has to share the USB bus with anything else) There is an easy workaround: plug this device in a port where it won't have to share the bus with any other device. I.e. if you have two USB ports on your machine, plug the prolific chip in one of them and everything else in a hub on the other port. I had no idea if things are better in windows, I thought it was an issue with the USB device itself. BTW, did you try the USB_EHCI_TT_NEWSCHED thing discussed in that thread ?
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