>When I halt the machine (shutdown -h) I cannot
>wake it.  However, if the machine is unplugged, then plugged back in,
>*then* I can wake it. 

WOL can be done a couple of ways.

If it is implemented using ACPI GPE's, then
you need to find a string (unfortunately, they're arbitrary)
in /proc/acpi/wakeup that looks like your device and echo that
string into the file to toggle between enabled and disabled.

Only Power/Sleep/LID buttons are enabled for wakeup by default.

Note that this I/F is temporary -- the ability of
a device to wake the system should really be a property
of that device in the /sys tree.

cheers,
-Len
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