Remote wakeup from standby

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My device is happily going into selective suspend and can be resumed by 
either the runtime PM APIs or by generating its own remote wakeup
signal.  However, it isn't able to resume from a system suspend.

I put my machine into suspend with:

# echo standby >/sys/power/state

wait a few seconds, press my remote-wakeup button on the device, but
nothing happens.  The board has power because my LEDs stay lit.  When I
resume the system by pressing the power button on the machine itself
everything comes back up as normal.

I put a sniffer on the bus and I see the host issue a CLEAR-FEATURE for
remote wakeup right before the suspend happens.

Is there some other configuration I need to set before this will work?

Thanks,

Rob.
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