On Mon, 1 Jul 2013, Martin van Es wrote: > Here's the usbmon log on bus 01 > > worflow: > 1. cat /sys/kernel/debug/usb/usbmon/1u > 1u.mon.out > 2. plug scanner > 3. scanimage -L > 4. unplug scanner > 5. stop cat The problems start here: ffff88023423db40 1844894429 S Bo:1:004:3 -115 4 = 01070001 ffff88023423db40 1844894484 C Bo:1:004:3 -71 0 ffff88023423db40 1844894509 S Co:1:004:0 s 02 01 0000 0003 0000 0 ffff88023423db40 1844894571 C Co:1:004:0 -71 0 Two transfers failed, with low-level errors. The second transfer was a Clear-Halt, even though the endpoint wasn't halted. ffff880231da76c0 1845894772 S Bo:1:004:3 -115 4 = 01070001 ffff880231da76c0 1845894861 C Bo:1:004:3 0 4 > ffff880232b38b40 1845894959 S Bi:1:004:2 -115 1 < ffff880232b38b40 1868423627 C Bi:1:004:2 -108 0 Then one transfer worked and another one hung. Next, for some unknown reason there was a logical disconnect. Maybe the scanimage program quit. ffff880232df6900 1877247948 C Ii:1:001:1 0:2048 1 = 04 ffff880232df6900 1877247970 S Ii:1:001:1 -115:2048 4 < ffff88020fef2840 1877248025 S Ci:1:001:0 s a3 00 0000 0002 0004 4 < ffff88020fef2840 1877248032 C Ci:1:001:0 0 4 = 00010100 This is the physical disconnect -- when the cable was unplugged. It happened 9 seconds after the logical disconnect. Martin, can you provide a similar usbmon trace with the scanner plugged into a USB-2 port? 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
