On Tue, 2 Jul 2013, Martin van Es wrote: > Here's the usbmon output on my old USB2 laptop, kernel 3.9.1 > Including the plug/unplug events. scanimage -L succesfully reports the > scanner and returns the prompt. The two usbmon traces are essentially identical (including the -71 errors!) right up to the point where the problem occurred. The only difference that might be relevant is that on the USB-3 port, transfers take place more quickly. Maybe that's the explanation: The scanner isn't able to cope when the packets arrive too rapidly. It _is_ clear from the usbmon data that the scanner is at least slightly buggy. On the other hand, it's also possible that a bug in the xHCI hardware or driver caused the scanner's response to get lost. I'm not sure how you can tell what's really going on without using a USB bus analyzer. 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
