On Thu, 26 Jun 2014, loody wrote: > hi all: > I try below flow: > 1. plug in usb card reader > 2. wait 2 seconds > 3. plug in SD card > > on ubuntu PC system, the udev can get SD plug in event > but on my embedded system, there is no udev plug event when SD plug in. > > Is this issue related to media change command? > if so, should I enable kernel config or do anything in user mode program? > > thanks for your help in advance, What does usbmon show? 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