On Wed, 6 Jun 2018, Anshuman Gupta wrote: > > > > In any case, when the system wakes up because of a signal received by a > > > > USB host controller, there should be a wakeup event associated with the > > > > host controller. Don't you get those events? > Yes we are getting those PM events but not consistently after debugging > I came to know that we are getting these host controller PM wakeup events, > but these events are only generated for newly plugged-in device. That is very strange. If the system is suspended, and a keypress on a USB keyboard (for example) causes the system to wake up, then pm_wakeup_event() _should_ be called for the host controller. If it isn't getting called then there might be a bug in the ACPI subsystem. I have CC'ed Rafael and the Linux PM mailing list, perhaps they can help track this down. Can you post the output from "lspci -vv" for your xHCI host controller? It's also worth noting that by default, USB host controllers are set up so that plugging in or unplugging a device will not wake up the system, but a wakeup request received from a device will. I wonder why your system does not behave this way. What is the power/wakeup setting for your root hub? > Will it be OK to send this patch for review, if you don't have any specific > concern. First I want to clear up this issue about wakeup events not being reported for host controllers. Once that is working correctly you may not even need the patch. Alan Stern PS: I noticed that your email messages (other than the first one in this thread) are getting delivered to me but not to the linux-usb mailing list. Do you have any idea why that is? Can you fix it? -- 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
