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[katsu <1404612@xxxxxxxxxxxxxxxxxx>]

-- recheck release kernels(trusty) --
$ uname -r
3.13.0-43-generic
$ ll /sys/class/net/wlan0/device/enable*
-rw-r--r-- 1 root root 4096 Dec 28 14:35 /sys/class/net/wlan0/device/enable
--> NG.(enabled -> enable)

$ uname -r
3.13.0-41-generic
$ ll /sys/class/net/wlan0/device/enable*
-rw-r--r-- 1 root root 4096 Dec 28 16:56 /sys/class/net/wlan0/device/enable
--> NG.(enabled -> enable)

$ uname -r
3.13.0-40-generic
$ ll /sys/class/net/wlan0/device/enable*
-rw-r--r-- 1 root root 4096 Dec 28 16:58 /sys/class/net/wlan0/device/enabled
--> OK.(enabled)

3.13.0-40-generic is OK.
but 3.13.0-41-generic & 3.13.0-43-generic is NG.


-- recheck upstream kernels archive --
linux-image-3.13.11-03131111-generic_3.13.11-03131111.201411111336_amd64.deb
$ uname -r
3.13.11-03131111-generic
$ ll /sys/class/net/wlan0/device/enable*
-rw-r--r-- 1 root root 4096 Dec 28 17:04 /sys/class/net/wlan0/device/enable
--> NG.(enabled -> enable)

linux-image-3.13.11-03131110-generic_3.13.11-03131110.201410302136_amd64.deb
$ uname -r
3.13.11-03131110-generic
$ ll /sys/class/net/wlan0/device/enable*
-rw-r--r-- 1 root root 4096 Dec 28 17:11 /sys/class/net/wlan0/device/enabled
--> OK.(enabled)

3.13.11-03131110-generic is OK.
but 3.13.11-03131111-generic is NG.


"/sys/class/net/wlan0/device/enabled" is changed to "/sys/class/net/wlan0/device/enable" by "kernel" which I loaded.(enabled -> enable)
I do nothing except that I change "kernel".
Is this not a problem of "kernel"?

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https://bugs.launchpad.net/bugs/1404612

Title:
  Power management of the wireless LAN does not work.

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  wireless script(/usr/lib/pm-utils/power.d/wireless) fixed by bug:1299975
  https://bugs.launchpad.net/ubuntu/+source/pm-utils/+bug/1299975

  /usr/lib/pm-utils/power.d/wireless
  --->---> snip --->---> snip --->---> snip --->---> snip --->--->
  23    [ "$(cat /sys/class/net/$1/device/enabled)" = "1" ] || return 1
  --->---> snip --->---> snip --->---> snip --->---> snip --->--->

  Power management works fine.
  There is no problem to kernel-3.13.0-40.

  but kernel-3.13.0-41 & -43 changed to /sys/class/net/wlan0/device/enable.
  ( enabled -> enable )
  Power management does not work.

  $ tail /var/log/pm-powersave.log
  --->---> snip --->---> snip --->---> snip --->---> snip --->--->
  Running hook /usr/lib/pm-utils/power.d/wireless false:
  cat: /sys/class/net/wlan0/device/enabled: No such file or directory
  /usr/lib/pm-utils/power.d/wireless false: success.
  --->---> snip --->---> snip --->---> snip --->---> snip --->--->

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-43-generic 3.13.0-43.72
  ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  yokoyama   2136 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Dec 21 15:46:21 2014
  HibernationDevice: RESUME=UUID=6ff533bf-2108-48e8-a717-5551b42f6ee7
  InstallationDate: Installed on 2014-04-18 (247 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 26897LJ
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic.efi.signed root=UUID=4ba0cc0c-00ce-4685-ba4c-cc3ea1a9b01a ro clocksource=hpet quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-43-generic N/A
   linux-backports-modules-3.13.0-43-generic  N/A
   linux-firmware                             1.127.10
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/12/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 62CN97WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Lenovo G580
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo G580
  dmi.modalias: dmi:bvnLENOVO:bvr62CN97WW:bd07/12/2013:svnLENOVO:pn26897LJ:pvrLenovoG580:rvnLENOVO:rnLenovoG580:rvrNotDefined:cvnLENOVO:ct10:cvrLenovoG580:
  dmi.product.name: 26897LJ
  dmi.product.version: Lenovo G580
  dmi.sys.vendor: LENOVO

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