kernel-packages team mailing list archive

[Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>]

On Sat, Nov 22, 2014 at 01:41:55AM -0000, Michael Heuberger wrote:
> Ok, understood. Well, I spotted the error in my dmesg output. There was
> something else trying to turn the powersave off which failed of course
> and an error was printed. That confused me.
> 
> If I have power support disabled, then no entity should try to switch
> powersave off. This to prevent error pollution in the dmesg output.
> Looks like somewhere in the code an if-check is missing.

There are various PM scripts which might be trying to turn power save on
and off based on certain events (specifically applying or removing
external power). They can't really tell whether it was you which turned
off power save or if it was turned off due to an event, and I'm sure
they aren't smart enough to know about module options they should check.
The errors are safe to ignore.

-- 
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https://bugs.launchpad.net/bugs/1394163

Title:
  Unable to turn powersave for wlan0 off

Status in “linux” package in Ubuntu:
  Invalid

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
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /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
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic root=UUID=b5b38333-3694-4441-8a13-50bf4dbf2f41 ro quiet
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-24-generic N/A
   linux-backports-modules-3.16.0-24-generic  N/A
   linux-firmware                             1.138
  RfKill:
   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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