WOL question

Julian Elischer julian at elischer.org
Tue Apr 10 21:59:58 UTC 2007

Jack Vogel wrote:
> I am hoping someone here who has more familiarity with the ACPI
> code can enlighten me....
> I have an internal bug filed complaining that FreeBSD disables
> wake-on-lan on the hardware. This means that if you boot, say,
> Linux, even Knoppix as a quickie, and then shutdown, if the
> hardware supports it, it will be left in a state where a magic-packet
> wakeup will work. However, even if I boot up a FreeBSD kernel
> with NO em driver, and then shutdown, it undoes the WOL setup.
> Now, I would like to have explicit WOL support added into the
> em driver, but before I even worry about that I need to understand
> where the kernel turns this off without the driver even needed.
> I've looked around at the dev/acpi and arch/acpi code and at
> least so far I'm having a hard time getting an adequate picture
> to know how it happens.
> Jack
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I think I heard once that some BIOSes turn it off during the boot cycle 
somewhere and it is up to the OS to turn it back on. I do know that some BIOSes
phuck with the NIC enough to stop IPMI from working during the boot.

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