My SC server wakes from ACPI S3 (suspend), S4 (hibernate), and S5
(poweroff) with no additional intervention configuration. I use CentOS
5 and did not need to modify the halt/shutdown scripts as seems to be
necessary in Fedora (from post). I suspect this change to the halt
script is not really necessary as Fedora versions that are now several
years old had already avoided removing interface options at shutdown
(and old versions of Fedora are the basis for RHEL/CentOS).

I set the WOL option using ethtool as part of system *startup* (e.g.
ETHTOOOL_OPTS="wol g" for me, where to do this depends on your distro,
or use /etc/rc.local) rather than shutdown, which avoids issues with
hibernate vs suspend vs shutdown scripts (all use different scripts,
e.g. pm-utils) as the option is already set *before* shutdown begins.

If a formerly working config longer works with new hardware, I would
focus on the NIC (is it different/less supported), BIOS (probably
different, is PME# wake enabled?), and ignore the blinking lights (they
do not confirm that WOL is working).

As always, there is definately more than one way to make this work. No
reason why adding the ethtool setting to the halt script would be
better/worse than setting it it at boot. Also beware if you
suspend/hibernate that you will probably need to set the WOL option
*again* after resume (I just restart the network service as part of the
pm-utils resume script). The CentOS 5 version of pm-utils is not smart
enough to do this automatically...


-- 
syburgh
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