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[Bug 1394163] Re: Unable to turn powersave for wlan0 off


Here's a couple of possibilities.

First of all, iwconfig uses wireless extensions, which is deprecated but
supported through emulation. I'm honestly not sure whether changing the
power save option is expected to work that way. Try using 'sudo iw wlan0
get power_save" for reading the power save state and 'sudo iw wlan0 set
powersave <state>" to set it, where <state> is either on or off.

The other possibility is that the ath9k.ps_enable is set then it's going
to fail exactly as you describe. Please run 'cat
/sys/module/ath9k/parameters/ps_enable'. I'm not sure off the top of my
head what this will output, but if it's something like "1" or "yes" or
"true" or "on" that means the flag is set and any attempt to change the
power save state will fail in this manner. If it outputs something like
"0" or "no" or "false" or "off" then the commands should succeed, even
if you aren't changing the state.

** Changed in: linux (Ubuntu)
   Importance: Medium => Low

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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  Unable to turn powersave for wlan0 off

Status in “linux” package in Ubuntu:

Bug description:
  $ sudo iwconfig wlan0 power off
  Error for wireless request "Set Power Management" (8B2C) :
      SET failed on device wlan0 ; Operation not supported.

  No idea why. It should work and I have wlan0 listed here:

  $ sudo iwconfig
  [sudo] password for michael-heuberger: 
  eth0      no wireless extensions.

  wlan0     IEEE 802.11bgn  ESSID:off/any  
            Mode:Managed  Access Point: Not-Associated   Tx-Power=off   
            Retry short limit:7   RTS thr:off   Fragment thr:off
            Encryption key:off
            Power Management:off
  lo        no wireless extensions.

  Any clues? Or is this a bug? Thanks for helping!

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-24-generic 3.16.0-24.32
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  Uname: Linux 3.16.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
   /dev/snd/controlC1:  michael-heuberger   2109 F.... pulseaudio
   /dev/snd/controlC2:  michael-heuberger   2109 F.... pulseaudio
   /dev/snd/controlC0:  michael-heuberger   2109 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Nov 20 00:55:19 2014
  HibernationDevice: RESUME=UUID=b0b47183-895a-4f27-bb25-40bd23028028
  InstallationDate: Installed on 2014-10-31 (19 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic root=UUID=b5b38333-3694-4441-8a13-50bf4dbf2f41 ro quiet
   linux-restricted-modules-3.16.0-24-generic N/A
   linux-backports-modules-3.16.0-24-generic  N/A
   linux-firmware                             1.138
   0: phy0: Wireless LAN
   	Soft blocked: yes
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/06/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0803
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6X58D-E
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0803:bd08/06/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6X58D-E:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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