I stated it backwards in comment #6 - if ps_enable is 0 then the
operation should fail, and if it's 1 it should work. Since you're
reading it as 0 (which is the default) that means power save support is
disabled and the operation is going to fail. iw probably just doesn't
output an error message in this case. If you use iw to enable power save
(sudo iw wlan0 set power_save on) then read the state (sudo iw wlan0 get
power_save) you should find that it's still disabled.
Since everything seems to be working as expected I'm closing this as
invalid. You can change the value of ps_enable if you want to be able to
enable/disable power save manually, but be warned that it sounds like
the reason that it's disabled by default is that power save is broken
with ath9k.
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
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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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