On Sat, 3 May 2014, Russel Hughes wrote: > sudo cat /sys/kernel/debug/usb/usbmon/2u > /tmp/1.mon.out > > first few hundred lines > > ffff880200adef00 2596394321 C Zi:2:004:1 0:1:1833:0 1 0:0:3 4 = 00030b00 > ffff880200adef00 2596394330 S Zi:2:004:1 -115:1:1833 1 -18:0:3 4 < > ffff8801f3c8e600 2596395313 C Zo:2:004:1 0:1:1830:0 5 0:0:264 It looks like you started the usbmon trace after the audio data transfer was running. I need to see what happens when the audio data transfer begins. Also, is there any way you can turn off the audio-in channel while running the test, so that only the audio-out is active? 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