On Thursday 05 April 2007 12:59 am, Zhang Rui wrote: > On Wed, 2007-04-04 at 08:41 +0800, David Brownell wrote: > > In that example, two devices don't actually exist (USB3, S139), one can't > > issue wakeup events (PCI0), and two seem harmlessly (?) confused (MDM and > > AUD are the same PCI device, but it's the _modem_ that does wake-on-ring). > > > Well, ACPI can't find the sysfs node for all the wakeup-enabled devices. The only example of that type in the example I provided is SLPB, where the sysfs node is ACPI-internal; I'm not sure how one can detect such cases. > In fact, only pci and pnp devices can be found now. Well, PNP courtesy of a previous patch from me, but remember that I was using that as an example of a ** BOGUS ACPI TABLE ** as summarized above. In my observation, such bogus tables are common. (This particular one was, I believe, copied from a system using a higher end version of the same southbridge ... but which may well have had its own errors.) > ACPI needs the ability to distinguish all the physical devices, i.e. map > ACPI device to physical device nodes in sysfs, which I mentioned before. For wakeup devices, the main issue I've seen is with button devices. In my limited set of test sytems, everything else is either PCI, PNP, or a bug (listing a non-existent device). If this patch starts to get deployed, I expect other people will find a few other curiousities ... and likely some things to be fixed. The /sys/devices/acpi_system:00/ tree is kind of new. I suspect one way it could be more informative is to set up cross-links in sysfs between the ACPI devices and the "real" device nodes ... e.g. on the system I'm using right now .../device:00/PNP0A03:00/device:15/PNP0B00:00 could have a link pointing to /sys/devices/pnp0/00:06 ... and that PNP node in turn could have an "acpi" link pointing back to the ACPI thing. Such cross-links would let people see those relationships, and observe which links are missing or otherwise strange. Fixing the bugs would seem unlikely until those things become visible. - Dave - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html