On Wed, Dec 19, 2012 at 03:15:09AM +0000, Ben Hutchings wrote: > On Mon, 2012-12-17 at 13:28 -0800, Sarah Sharp wrote: > > On Sun, Dec 16, 2012 at 12:37:00AM +0000, Ben Hutchings wrote: > > > Since Linux 3.2.16, my desktop with an Asus P8Z68-V LX motherboard > > > always wakes up a few seconds after I shutdown. I then have to switch > > > it off a second time. This still occurs in Linux 3.6.9 (haven't tried > > > 3.7 yet). > > > > Hmm. So if we enable PCI bus suspend for this xHCI host controller, > > then it will immediately wakeup the system on shutdown? > > So it seems. > > > What happens when runtime PM is enabled for the host (and any USB > > devices attached to it)? Does the host controller stay in D3hot, or > > does it immediately pop back into D0? > > It stays in D3hot. Also, this fixes the problem. > > > Can you turn on CONFIG_USB_XHCI_HCD_DEBUGGING and CONFIG_USB_DEBUG for > > your kernel and send me the dmesg? I'm wondering if the xHCI host > > controller is either failing to complete the host suspend command, or > > perhaps failing to be halted. > > This happens in S5 (soft-off), so there is no way to read dmesg > afterwards! I just checked S3 (mem) and S4 (disk), and the system stays > properly suspended in those states. > > I set sysctl kernel.printk=8 and recorded the screen during shutdown, > from which I transcribe the following: > > pcieport 0000:00:1c.6: wake-up capability enabled by ACPI > xhci_hcd 0000:04:00.0: // Halt the HC > xhci_hcd 0000:04:00.0: xhci_shutdown completed - status = 1 Ok, then the xHCI host controller reported that it did halt successfully. It should not be sending any interrupts or PMEs when it's halted. > ACPI: Preparing to enter system sleep state S5 > Disabling non-boot CPUs ... > Power down. > acpi_power_off called > > The first line is related to wake-on-LAN as the specified device is the > downstream port connected to the network controller. > > [...] > > > No devices are connected to the xHCI. > > > > > > 'echo disabled > /sys/bus/pci/devices/0000:04:00.0/power/wakeup' does > > > *not* work around this. > > > > Does unloading the xHCI driver before shutdown fix this? > [...] > > Yes. > > Also, I tried plugging devices into the USB 3.0-capable ports. Plugging > in a mouse fixes this. Plugging in a super-speed SATA enclosure > doesn't. > > So, as far as I can see this problem is specific to: > - Sleep in S5 > - Driver loaded > - Run-time power management disabled > - No devices or super-speed device plugged in > > Any of these avoid the problem: > - Sleep in S3 or S4 > - Driver unloaded > - Run-time power management enabled > - Low-speed device plugged in Is it any low speed device, or just a mouse? Does a connected keyboard or a USB serial device make the system stay shutdown? The symptoms are pretty bizarre, and I honestly don't know what could be the root cause. I would suggest you try the BIOS update and see if it fixes the issue. Sarah Sharp -- 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
