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

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?

Sure.
Here is the complete log of one boot and two s2disk_platform cycles
captured using the serial console (in the first s2disk I forgot to
remove the 'turn off /sys/bus/usb/device/usb?/power/wakeup' part).

Interestingly even with power/wakeup disabled for usb1 and usb2,
which I assume to be the usb root ports, I could wake up the system
by pressing a key on my keyboard (which didn't work before turning
on CONFIG_USB_SUSPEND).

On the second suspend the system rebooted immediately as expected
(I power/wakeup for usb1 and usb2 back on and disabled the part in
the script).

I think this might be some general usb hw flakiness, since it seems
to detect (and has so for a long time) a non-existing device:

lsusb output:
Bus 002 Device 003: ID 045e:00db Microsoft Corp. Natural Ergonomic Keyboard 4000 V1.0
Bus 002 Device 002: ID 045e:0040 Microsoft Corp. Wheel Mouse Optical
Bus 002 Device 001: ID 1d6b:0001
Bus 001 Device 001: ID 1d6b:0002

bogus device?:
[14316046.469949] usb 2-4: new full speed USB device using ohci_hcd and address 12
[14316046.679951] usb 2-4: device descriptor read/64, error -62
[14316046.986619] usb 2-4: device descriptor read/64, error -62
[14316047.263284] usb 2-4: new full speed USB device using ohci_hcd and address 13
[14316047.476614] usb 2-4: device descriptor read/64, error -62
[14316047.786618] usb 2-4: device descriptor read/64, error -62
[14316048.063282] usb 2-4: new full speed USB device using ohci_hcd and address 14
[14316048.499945] usb 2-4: device not accepting address 14, error -62
[14316048.669950] usb 2-4: new full speed USB device using ohci_hcd and address 15
[14316049.106612] usb 2-4: device not accepting address 15, error -62
[14316049.112960] hub 2-0:1.0: unable to enumerate USB device on port 4

It's possible. Maybe there's a builtin broken USB device, or maybe the
D+ pin on port 4 is wired to a positive voltage source.

The log didn't reveal anything. Perhaps you can learn more by looking
at the "registers" file for that OHCI controller in debugfs.

Also, you should run "lspci -vv" as root to see what wakeup signals the
USB controllers are issuing.

Alan Stern

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