On Wed, 16 May 2012, Lan Tianyu wrote: > Ok. Let me reconfirm the meaning of these opinions. > > "auto" > if port without device, turn off power directly. > if port with device, turn off power when the device is suspended. > > "on" the port's power must be on. > > "off" the port's power must be off. > > Right? Maybe the "auto" setting should be renamed "active". Then "auto" can be used for: If the port has a device, turn the power on. If the port doesn't have a device, turn the power off. 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