> In principle, there is a specified behavior for usb devices when the PC goes 
> to standby or wakes up. The other way round, as good as i understand, a usb 
> device should be able to wake a sleeping PC.
> 
> Can anyone please let me know whether we already have the required 
> infrastructure in the kernel and if yes, how to test the feature?

There's no infrastructure for it yet.  I'd like to see this added in the 2.5
tree, building on the new device tree stuff (get the latest prepatch).

PCI has some special methods to enable remote wakeup.  In some
configurations, some USB devices can leverage that facility.  I think
the short version of the story is that the hub driver needs updating to
recognize those configurations, and enable remote wakeup for those
devices during suspend processing.  (Evidently some devices don't
behave right if you do it earlier.)

- Dave



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