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

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