On Wed, 28 Sep 2011, Rafael J. Wysocki wrote: > > > That's possible. Moreover, it is possible that the BIOS removes power > > > from the bus segment the device is on entirely, in which case it would > > > need the auxiliary power source to generate wakeup events. > > > > Is there any way to find out whether this is happening? > > Frankly, I don't know. > > We may be entering an area that's never been tested by any vendors > in this case. Probably not. Still, I thought perhaps a little special-purpose debugging code at the right spot in the appropriate PCI early-resume routine might be able to read the PME# status before the device gets reset or its config space gets overwritten. (Although if the BIOS messes around with the controller, it might destroy what I'm looking for. Maybe disabling USB support in the BIOS will help...) What's the earliest spot in the resume path where I can read the PME# status? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
