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    SubjectRe: [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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