On Tue, 18 Jun 2013, Ming Lei wrote: > Both 4 transfers can work well on EHCI HCD after switching to run "Both 4 transfers"? The word "both" applies when there are two items, not more than two. And what are the four transfers you are referring to? Do you mean all four transfer _types_? 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