Public bug reported:
It seems like power management is no longer supported with the Intel
WiFi Link 5100 card (using iwlagn driver) with 2.6.31.
cyberf...@cyberfish-laptop:~$ sudo iwconfig wlan0 power on
[sudo] password for cyberfish:
Error for wireless request "Set Power Management" (8B2C) :
SET failed on device wlan0 ; Operation not supported.
cyberf...@cyberfish-laptop:~$ iwconfig wlan0
wlan0 IEEE 802.11abgn ESSID:"LAI"
Mode:Managed Frequency:2.412 GHz Access Point: 00:1C:10:B2:14:AA
Bit Rate=54 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=48/70 Signal level=-62 dBm Noise level=-88 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
Used to work in 2.6.30.
This bug has a big effect on battery life, because it can save about 2W
of power consumption, and my laptop (Acer TImeline 3810t) only consumes
about 8-9W.
Thanks!
ProblemType: Bug
Architecture: i386
Date: Mon Jul 27 14:21:10 2009
DistroRelease: Ubuntu 9.10
HibernationDevice: RESUME=UUID=6f9ae10f-02b2-4a96-a7d7-700e22184757
MachineType: Acer Acer Project
Package: linux-image-2.6.31-4-generic 2.6.31-4.22
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-4-generic
root=UUID=b6d9abe7-e298-4e5e-984c-336ff8330d98 ro quiet splash
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-4.22-generic
RelatedPackageVersions: linux-backports-modules-2.6.31-4-generic N/A
SourcePackage: linux
Uname: Linux 2.6.31-4-generic i686
dmi.bios.date: 05/27/2009
dmi.bios.vendor: Acer
dmi.bios.version: V1.04
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Acer Project
dmi.board.vendor: Acer
dmi.board.version: PSMBOU-1234567
dmi.chassis.asset.tag: None
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: None
dmi.modalias:
dmi:bvnAcer:bvrV1.04:bd05/27/2009:svnAcer:pnAcerProject:pvrV1.04:rvnAcer:rnAcerProject:rvrPSMBOU-1234567:cvnAcer:ct10:cvrNone:
dmi.product.name: Acer Project
dmi.product.version: V1.04
dmi.sys.vendor: Acer
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386
--
Intel WiFi Link 5100 (iwlagn) power management regression in 2.6.31
https://bugs.launchpad.net/bugs/405158
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