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[Bug 1404612] Re: Power management of the wireless LAN does not work.

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: katsu <1404612@xxxxxxxxxxxxxxxxxx>
Date: Mon, 29 Dec 2014 06:25:45 -0000
Reply-to: Bug 1404612 <1404612@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
We are sorry to have confused you with poor English.

My wireless card is Qualcomm Atheros AR9285 Wireless Network Adapter.
kernel driver in use: ath9k driver.
Power management is OFF by Default.
but driver option is set to ps_enable=1.(ps_enable: Enable WLAN PowerSave)

$ cat /etc/modprobe.d/ath9k_powersave.conf 
options ath9k ps_enable=1


# AC adapter connect & kernel 3.13.0-40-generic.

$ tail /var/log/pm-powersave.log
Running hook /etc/pm/power.d/wireless false:
Turning powersave for wlan0 off...Done.    <--- off
/etc/pm/power.d/wireless false: success.

$ iwconfig
wlan0     IEEE 802.11bgn  ESSID:"?????????"
          Mode:Managed  Frequency:2.412 GHz  Access Point: ??:??:??:??:??:??
          Bit Rate=1 Mb/s   Tx-Power=14 dBm
          Retry  long limit:7   RTS thr:off   Fragment thr:off
off--->   Power Management:off
          Link Quality=46/70  Signal level=-64 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:2  Invalid misc:1278   Missed beacon:0

# AC adapter disconnect(battery power) & kernel 3.13.0-40-generic.

$ tail /var/log/pm-powersave.log
Running hook /etc/pm/power.d/wireless true:
Turning powersave for wlan0 on...Done.    <--- on
/etc/pm/power.d/wireless true: success.

$ iwconfig
wlan0     IEEE 802.11bgn  ESSID:"?????????"
          Mode:Managed  Frequency:2.412 GHz  Access Point: ??:??:??:??:??:??
          Bit Rate=1 Mb/s   Tx-Power=14 dBm
          Retry  long limit:7   RTS thr:off   Fragment thr:off
on --->   Power Management:on
          Link Quality=46/70  Signal level=-64 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:2  Invalid misc:1278   Missed beacon:0

Power management is works fine.
but kernel 3.13.0-41-generic & 3.13.0-43-generic is does not work.

# AC adapter connect & (kernel 3.13.0-41-generic or 3.13.0-43-generic).

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

$ iwconfig
wlan0     IEEE 802.11bgn  ESSID:"?????????"
          Mode:Managed  Frequency:2.412 GHz  Access Point: ??:??:??:??:??:??
          Bit Rate=1 Mb/s   Tx-Power=14 dBm
          Retry  long limit:7   RTS thr:off   Fragment thr:off
off--->  Power Management:off
          Link Quality=46/70  Signal level=-64 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:2  Invalid misc:1278   Missed beacon:0

# AC adapter disconnect(battery power) & (kernel 3.13.0-41-generic or
3.13.0-43-generic).

** "ON" does not have it. **

$ tail /var/log/pm-powersave.log
cat: /sys/class/net/wlan0/device/enabled: No such file or directory  <--- error

$ iwconfig
off--->  Power Management:off


** a cause **
cat: /sys/class/net/wlan0/device/enabled: No such file or directory  <--- error

"/sys/class/net/wlan0/device/enabled" is assumed in wireless script.
(wireless script: /usr/lib/pm-utils/power.d/wireless in pm-utils package)
but changed to "/sys/class/net/wlan0/device/enable" on kernel 3.13.0-41 & 43-generic.
(filename: enabled -> enable)
So can not control wireless script in pm-utils package.

-- 
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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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References

[Bug 1404612] [NEW] Power management of the wireless LAN does not work.
From: katsu, 2014-12-21