[linux-pm] ehci_hcd related S3 lockup on ASUS laptops, again
rostedt at goodmis.org
Thu Apr 12 16:33:22 UTC 2012
On Thu, 2012-04-12 at 10:28 -0400, Alan Stern wrote:
> Hmmm. This is a situation where the wakeup setting might matter. Did
> the /sys/bus/pci/devices/0000:00:1[ad].0/power/wakeup files both
> contain "enabled" when you ran the test?
They're both enabled for me too.
> Here's a diagnostic patch that will give us a little more information.
> Keep the previous change (so that pci_prepare_to_sleep gets called
> whether ehci-hcd is bound or not) and let's see what it says. Try
> doing it both with and without ehci-hcd bound. Running this with "echo
> devices >/sys/power/pm_test" ought to be good enough.
Where do I read out the dev info?
> Alan Stern
> Index: usb-3.4/drivers/pci/pci.c
> --- usb-3.4.orig/drivers/pci/pci.c
> +++ usb-3.4/drivers/pci/pci.c
> @@ -1720,6 +1720,9 @@ int pci_prepare_to_sleep(struct pci_dev
> error = pci_set_power_state(dev, target_state);
> + dev_info(&dev->dev, "target %d wakeup %d error %d\n",
> + target_state, device_may_wakeup(&dev->dev), error);
> if (error)
> pci_enable_wake(dev, target_state, false);
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