Hi, On Mon, Mar 01, 2004 at 11:46:58AM -0500, m. allan noah wrote: > if that works, then perhaps there is a libusb/linux kernel error that > prevents the DATA0/1 toggle from frobbing.
IIRC that's a bug in some USB chipsets. It happens when the connection is resetted (?). The USB spec says that in this case the toggle should be set to 0. Linux does that but some USB chips (e.g. Mustek 1017) doesn't. So everytime the connection is reset with toggle = data1 the communication fails. With libusb this happens after every close. With the kernel scanner driver only when the module is unloaded. On *BSD it also happens with every close(). So it may not be a bug in the kernel. Bye, Henning
