MrClive,
You must have a look at the PM events table on the comp in addition to
using ethtool ("cat /proc/acpi/wakeup".) If you see things like this,
and assuming the ethernet card is connected on this port ("lspci -vv"
will tell you somehow)
Code:
--------------------
PCI1 S3 *disabled pci:0000:00:1e.0
--------------------
you need to "echo PCI1 > /proc/acpi/wakeup" to change the status to
"enabled". Then the WOL received and processed by the card would be
propagated to the OS, and hopefully the PC would wake-up. And not hang
during wake-up.
You would need to put the appropriate echo line in a boot script, such
as /etc/rc.local, because changes to /proc/ are not sticky across
reboots. This example line mentions "S3" which means suspend: WOL from
suspend would work, and probably WOL from soft off (S5). If you read S5
instead of S3, there is a chance wakeup won't work at all regardless of
what ethtool says. S4 means hibernate.
If the comp wakes from suspend or hibernate, you could compare power
consumption in this mode and in power off mode. Hibernate is "save state
to disk, then soft-off" so power draw should read the same. But I would
say there is a good chance that this old machine draws the same amount
of power in suspend mode as well. If that's true, then you might
consider using this state instead of shutting down.
(I am right now in the process of circumventing the power management
oddities of a Dell PC circa 2005 using controlled power feed. Long story
short, this is a potentially complex and most probably cost-ineffective
way of doing things. But if the computer has a BIOS setting to power-up
after mains power loss, you could consider that possibility, too.)
Good luck!
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