How can I debug S3/s4r in windbg

Dear all,

Dear all,
How can windbg reconnect itself to vista target when returning from S3?
I use 1394 cable to debug. I found VISTA target disconnected from windbg after it resume from S3.

I search this issue online, I found somone said VISTA support reconnecting from S3, but reconnection will failed if target failed before 1394 work. He recommand to use serial cable.

But more and more machines don’t take serial port. So I want to know we need to set something if I want to make reconnection to be succeed in VISTA.

Thank you very much.