Re: PME# for add-on cards

Rafael J. Wysocki
2009-08-24T18:39:07Z

On Monday 24 August 2009, Matthew Garrett wrote:
> On Mon, Aug 24, 2009 at 01:12:39AM +0200, Rafael J. Wysocki wrote:
>
> > 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#.
>
> Mm. That sounds entirely plausible. If it were a built-in card then the
> DSDT would provide that GPE, but as an add-in...
>
> > 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?
>
> I'd expect this to be the case in general, yes. Systems that work
> without this probably have the BIOS enable it themselves on suspend. I
> suspect we'll have to set it to make sure.

OK, Matthew, Alan, thanks for your opinions.

I'll try to implement this, then.

Best,
Rafael