4.8-rc5 was fine, but 4.8-rc6 and 4.8-rc7 on a Lenovo Thinkpad x220 report this warning or error (cannot tell) anytime a USB mass storage device is inserted into a usb port (2.0 or 3.0): runtime PM trying to activate child device host6 but parent (2-1.2:1.0) is not active The device appears to be working regardless. -- 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