On Mon, 22 May 2017, Kai-Heng Feng wrote: > So in order to detect SD card under runtime PM, it's a perfectly > normal behavior, right? Yes. > Sorry for not explaining the original question well enough - the real > problem is that after enabling runtime PM on EHCI, the two physical > ports on the right side of the laptop no longer response to any > device, e.g. an USB storage or an USB mouse. Please collect two usbmon traces: one with runtime PM disabled and one with runtime PM enabled. For each trace, start with nothing plugged into the right-side ports. Then after the trace has been running for a second or two, plug in a device. Stop the trace a couple of seconds after that. Instructions for usbmon are in Documentation/usb/usbmon.txt in the kernel source. 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
