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, -- 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