[CentOS] Getting Wake on lan to work

Fri Oct 8 23:25:26 UTC 2010
Scott Silva <ssilva at sgvwater.com>

on 10-6-2010 2:27 PM Robert Heller spake the following:
> 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.
If the card goes dark when the system is off but still plugged in, the card
does not get its power and signal from the pci bus and will need the header
cable plugged in. There is no other way... The card HAS to be powered from
somewhere at all times so it can activate the system.