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[Bug 1168255] [NEW] Enabling wakeup on the USB Root Controller prevents computer from suspending

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From: Launchpad Bug Tracker <1168255@xxxxxxxxxxxxxxxxxx>
Date: Fri, 05 Dec 2014 18:17:35 -0000
Reply-to: Bug 1168255 <1168255@xxxxxxxxxxxxxxxxxx>
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Steps to reproduce:
1) As root: # echo enabled > /sys/bus/usb/devices/2-1/power/wakeup
2) Attempt to suspend computer.

Expected results:
Computer should suspend.

Observed results
Computer goes into suspend then immediately wakes up. There is nothing informative in /var/log/pm-suspend.log

Background:
This bug was discovered by a udev script that I wrote to allow waking my computer up from suspension by attached USB devices. This is the script:
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="15d9", ATTRS{idProduct}=="0a4d" RUN+="/bin/sh -c 'echo enabled > /sys$env{DEVPATH}/../power/wakeup'"

A recent regression meant that this now prevents the computer from
suspending as above. This script now writes "enabled" to both
/sys/bus/usb/devices/2-1/power/wakeup and
/sys/bus/usb/devices/2-1/2-1.1/power/wakeup . I'm not sure if the
regression was that it now writes to the former as well as the latter,
or if it always has written to both, and a regression in pm-suspend now
cannot deal with the former. If I write "disabled" to the former, I can
suspend as normal.

More information:
$ lsusb -t
 /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/8p, 480M
        |__ Port 1: Dev 5, If 0, Class=HID, Driver=usbhid, 1.5M
        |__ Port 5: Dev 3, If 0, Class='bInterfaceClass 0xe0 not yet handled', Driver=btusb, 12M
        |__ Port 5: Dev 3, If 1, Class='bInterfaceClass 0xe0 not yet handled', Driver=btusb, 12M

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: pm-utils 1.4.1-9
ProcVersionSignature: Ubuntu 3.5.0-27.46-generic 3.5.7.7
Uname: Linux 3.5.0-27-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Fri Apr 12 16:32:39 2013
InstallationDate: Installed on 2012-12-16 (116 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: pm-utils
UpgradeStatus: Upgraded to quantal on 2013-01-31 (71 days ago)

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug quantal
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Enabling wakeup on the USB Root Controller prevents computer from suspending
https://bugs.launchpad.net/bugs/1168255
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