[CentOS] Getting Wake on lan to work

[Robert Heller]

At Wed, 06 Oct 2010 21:33:25 +0100 CentOS mailing list <centos at centos.org> wrote:

> 
> My system is: 
> Intel CC820 motherboard (which supports PME# wake up for wake on LAN)
> 3com 3C905C which also supports wake on LAN via PME#
> Linux 5.5
> 
> The motherboard BIOS is later than one that reports an issue with WOL
> and this particular network card was fixed.
> 
> But when I turn off the PC (shutdown or poweroff commands or front
> panel button), it cannot be restarted via WOL. The network light on
> the Ethernet card goes off so it looks like power is not being
> retained on the card. 
> 
> Although both the card and the motherboard have WOL headers my
> understanding is that these are not necessary if using PME# - is that
> correct? (I don't happen to have a WOL cable so can't just try one to
> confirm).

Wondering if there is a BIOS setting for enabling PME# (and/or a
setting/jumper on the NIC for this as well -- maybe ethtools or the
3COM tool (I believe there is a Linux port available) can set this.

> 
> How can I make Linux shutdown and leave the Ethernet power on?

I believe you need configure the power management setting in the BIOS to
leave the system in 'standby' mode or something like that, rather than
'power off'.  That is, the ACPI 'power off' command yields 'standby'
mode (or something like that).

> 
> The common suggestion on the 'net is to remove the "-i" switch from
> the shutdown script, but it was not present to start with.
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>                                                                   

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