On Thu, 12 May 2011, Xu, Andiry wrote: > > -----Original Message----- > > From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb- > > owner@xxxxxxxxxxxxxxx] On Behalf Of Dwight Schauer > > Sent: Thursday, May 12, 2011 12:58 AM > > To: linux-usb@xxxxxxxxxxxxxxx > > Cc: dschauer@xxxxxx > > Subject: xHCI and suspend/resume > > > > What is the current state of suspend/resume in xhci_hcd? > > > > Xhci-hcd supports suspend/resume/remote wakeup. > > > I'm using 2.6.39-rc7-gregkh and the NEC (pci 1033:0194) and the TI > > USB-3 (pci 104c:8241) host controllers don't show up in > > /proc/acpi/wakeup (and do not have a > > /sys/bus/usb/devices/XXX/power/wakeup entry). > > > > I think the /proc/acpi/wakeup list is set up by BIOS through ACPI > table. On my platform the on-board xHCI controller is showed in > /proc/acpi/wakeup as XHC0 and XHC1, but the external NEC host > controller does not appear in it. Right; an add-on device isn't known to the ACPI and hence doesn't show up (although devices on the motherboard should appear). Besides, /proc/acpi/wakeup is deprecated anyway; nowadays you're supposed to use /sys/.../power/wakeup instead. Dwight's problem is that he is looking in the wrong place. The xHCI controller is not a USB device; it's a PCI device -- i.e., it communicates with the computer over a PCI bus and not over a USB bus. Therefore it shows up under /sys/bus/pci, not /sys/bus/usb. 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
