Re: [linux-pm] PME# for add-on cards

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On Mon, 24 Aug 2009, Rafael J. Wysocki wrote:

> Hi,
> 
> Recently we've had a bug report indicating that WoL doesn't work with e100,
> although the driver does everything needed to support it.  Apparently, the user
> had to echo PCI0 to /proc/acpi/wakeup to make it work.
> 
> After some debugging it turned out that PCI0 is the PCI host bridge
> (no-bus:pci0000:00), so apparently echoing PCI0 to /proc/acpi/wakeup causes
> a wake-up GPE to be set up for the host bridge which triggers wake-up once
> eth0 signals PME#.
> 
> So, it looks like we need to set up wake-up GPE for a host bridge for PME#
> from add-on cards to work, at least on this particular box.
> 
> First, I wonder if that's the case in general (anybody knows?).  Second, if
> that is the case, would it be a good idea to set up the host bridge wake-up GPE
> by default?

Regarding the last question: Yes, of course.  Why wouldn't it be a good 
idea?

Alan Stern

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