On Sat, 14 Nov 2009, Oliver Neukum wrote: > Am Samstag, 14. November 2009 18:47:04 schrieb Alan Stern: > > The other is that the camera really is sending empty data packets. > > Then one has to figure out why the camera behaves differently in the > > two environments; presumably only the manufacturers have enough > > information to make that determination. > > Indeed. Therefore this route may be an unproductive path. I agree. And I agree that it's looking more and more as though the differences in schedulng between ohci-hcd and uhci-hcd are somehow responsible. But the usbmon traces show each URB ending at exactly the expected time, which means the scheduling is as it should be. And it's hard to see how the driver could think that a packet contained 0 bytes when it actually contained more. A bus analyzer would at least help narrow down the search space. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
