On Thu, 26 Aug 2010, Oliver Neukum wrote: > Am Donnerstag, 26. August 2010, 19:08:44 schrieb Alan Stern: > > > With the patch the controller remains in the OPERATIONAL state, which > > means it continues to generate SOF packets. So why would the device go > > into suspend? > > > > Maybe this really is some weird vendor-specific thing. > > OK, I may be dense, but we are talking about system shutdown, which implies > powering down the controller, right? Not necessarily, no. Shutdown is ACPI S5 (Soft Off). It is similar to the S4 state used in hibernation in that the spec "assumes" devices are "powered off". But that doesn't prevent some systems from still supplying power to various components -- as we have seen from these bug reports. Don't forget that it is possible on some systems to do remote wakeup from hibernation. Since we "assume" S4 and S5 treat devices the same way, this implies that some devices continue to receive suspend power during S5. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
