Re: [linux-pm] [PATCH 0/4] Fix forcedeth hibernate/wake-on-lan problems

On Sun, 1 Jun 2008, Tobias Diedrich wrote:

Ok, after another long debugging session I finally found out the
reason for the immediate reboot (after finding the place that
suspends the serial console (drivers/pnp) and disabling that suspend
path):
The system is woken up by USB activity! (Optical mouse, anyone?)

Lo and behold:
drivers/usb/core/hcd-pci.c tries it's best to activate 'wake on
usb', which I didn't know since it apparently also never worked.
However, after applying the 'use platform_enable_wakeup'-patch,
not only forcedeth wake starts working, also usb wake.
If I prevent usb wake:
|echo disabled > /sys/devices/pci0000\:00/0000\:00\:02.0/power/wakeup'
|echo disabled > /sys/devices/pci0000\:00/0000\:00\:02.1/power/wakeup'
And then hibernate in platform mode, the immediate reboot is gone
and waking up using magic packets works fine even without setting up
/proc/acpi/wakeup first.

Maybe I should try hooking mouse and keyboard onto different usb
host controllers, so I can disable wakeup for the mouse host
controller and enable wakeup for the keyboard host controller,
then it should be possible to wake the system by pressing a key. :)

You don't need to do that. Wakeup can be set specifically for each
individual USB device, provided CONFIG_USB_SUSPEND is enabled.


On Sun, 1 Jun 2008, Tobias Diedrich wrote:

(BTW I first thought the 'immediate reboot because of usb wake' effect is
caused by the optical mouse generating a wake event, but it rather
seems to be a problem with a flaky secondary usb host controller,
which sees a connected device where nothing is attached)

Can you provide debugging information (i.e., CONFIG_USB_DEBUG) with the
details on this bogus wakeup?

Alan Stern


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