Enabling wakeup on the USB Root Controller prevents computer from suspending

[Sparhawk]

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)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[penalvch (penalvch)]

Sparhawk, thank you for reporting this bug to Ubuntu. Quantal reached EOL on May 16, 2014.
See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases

Is this reproducible in the latest release of Ubuntu via http://cdimage.ubuntu.com/daily-live/current/ ?

If so, please execute the following via a terminal in order for the necessary debugging information to be attached:
apport-collect 1168255

[Sparhawk (sparhawkthesecond)]

I've moved to Arch Linux (which works fine), so this bug can be closed. I can see that (at least) two other people were affected, so they are welcome to refile this bug.

[Sparhawk (sparhawkthesecond)]

No longer using Ubuntu.