On Sat, 22 Aug 2009, Wu Zhangjin wrote:
> > I think the interface you're looking for is
> >
> > /sys/bus/usb/devices/usbN/../power/wakeup
> >
> > where N is the USB bus number. This file defaults to "disabled"; if
> > you write "enabled" to it then the USB host controller will be enabled
> > as a wakeup source. This should work even without ACPI; it uses the
> > PCI PME mechanism.
> >
>
> I checked the /sys/bus/usb.../wakeup interfaces, seems the
> usbN/power/wakeup interfaces are enabled by default in my machine, but
> the usbN/N-X:Y/power/wakeup is not available. so, I can not wakeup the
> system via any USB devices.
>
> Here is the output:
>
> $ find /sys/bus/usb/devices/usb1/ -name "wakeup" -exec echo {} \; -exec
> cat '{}' \;
> /sys/bus/usb/devices/usb1/power/wakeup
> enabled
...
You did not read what I wrote.
You shouldn't look at: /sys/bus/usb/devices/usb1/power/wakeup.
You should look at: /sys/bus/usb/devices/usb1/../power/wakeup.
The N-X:Y/power/wakeup interfaces don't matter; the kernel doesn't
use them.
Alan Stern
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