kernel-packages team mailing list archive

[Jonathan Lange <jml@xxxxxxxxx>]

Public bug reported:

I got a new router (ASUS RT-AC66U) and wifi on my laptop started getting
really slow, most noticeable in the way it dropped packets and had very
long roundtrip times for 'ping 8.8.8.8'

Searching online, I discovered that this might be due to a power saving
feature, which says that some routers have a bug that makes power save
polling not work. See
http://www.intel.com/support/wireless/wlan/sb/cs-006205.htm for details.

Sure enough, when I plugged my AC in, packet loss went away and
everything was great. When I removed it, packet loss appeared again.
When I ran "iwconfig wlan0 power off" while AC unplugged, that restored
correct behaviour.

Following the advice at http://blog.linuxjunkie.com/blog/2012/04/11
/linux-and-the-intel-centrino-wireless-n-1030/ I edited /usr/lib/pm-
utils/power.d/wireless and changed line 39 (standard Ubuntu 13.10
config) from "power on” to “power off”.

This fix "works" but obviously means the wifi will drain more power than
it needs to. For me with this laptop, this is an acceptable trade-off.
In an ideal world it would only be off for broken routers.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-13-generic 3.11.0-13.20
ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
Uname: Linux 3.11.0-13-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  jml        2939 F.... pulseaudio
Date: Fri Nov 22 09:04:37 2013
HibernationDevice: RESUME=UUID=b85b0353-c88b-4a7b-93ca-aa6190b1ff4d
InstallationDate: Installed on 2012-03-01 (630 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
MachineType: LENOVO 1080
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-13-generic root=UUID=36faead1-a41c-4363-813a-2c4c56e715ef ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-13-generic N/A
 linux-backports-modules-3.11.0-13-generic  N/A
 linux-firmware                             1.116
SourcePackage: linux
UpgradeStatus: Upgraded to saucy on 2013-10-27 (25 days ago)
dmi.bios.date: 11/21/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 56CN38WW
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: U300s
dmi.board.vendor: LENOVO
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad U300s
dmi.modalias: dmi:bvnLENOVO:bvr56CN38WW:bd11/21/2011:svnLENOVO:pn1080:pvrLenovoIdeaPadU300s:rvnLENOVO:rnU300s:rvr1.0:cvnLENOVO:ct10:cvrLenovoIdeaPadU300s:
dmi.product.name: 1080
dmi.product.version: Lenovo IdeaPad U300s
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug saucy uec-images

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1253951

Title:
  Intel wifi power save polling (PSP) causes connection issues with some
  access points

Status in “linux” package in Ubuntu:
  New

Bug description:
  I got a new router (ASUS RT-AC66U) and wifi on my laptop started
  getting really slow, most noticeable in the way it dropped packets and
  had very long roundtrip times for 'ping 8.8.8.8'

  Searching online, I discovered that this might be due to a power
  saving feature, which says that some routers have a bug that makes
  power save polling not work. See
  http://www.intel.com/support/wireless/wlan/sb/cs-006205.htm for
  details.

  Sure enough, when I plugged my AC in, packet loss went away and
  everything was great. When I removed it, packet loss appeared again.
  When I ran "iwconfig wlan0 power off" while AC unplugged, that
  restored correct behaviour.

  Following the advice at http://blog.linuxjunkie.com/blog/2012/04/11
  /linux-and-the-intel-centrino-wireless-n-1030/ I edited /usr/lib/pm-
  utils/power.d/wireless and changed line 39 (standard Ubuntu 13.10
  config) from "power on” to “power off”.

  This fix "works" but obviously means the wifi will drain more power
  than it needs to. For me with this laptop, this is an acceptable
  trade-off.  In an ideal world it would only be off for broken routers.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-13-generic 3.11.0-13.20
  ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
  Uname: Linux 3.11.0-13-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jml        2939 F.... pulseaudio
  Date: Fri Nov 22 09:04:37 2013
  HibernationDevice: RESUME=UUID=b85b0353-c88b-4a7b-93ca-aa6190b1ff4d
  InstallationDate: Installed on 2012-03-01 (630 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
  MachineType: LENOVO 1080
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-13-generic root=UUID=36faead1-a41c-4363-813a-2c4c56e715ef ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-13-generic N/A
   linux-backports-modules-3.11.0-13-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-10-27 (25 days ago)
  dmi.bios.date: 11/21/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 56CN38WW
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: U300s
  dmi.board.vendor: LENOVO
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad U300s
  dmi.modalias: dmi:bvnLENOVO:bvr56CN38WW:bd11/21/2011:svnLENOVO:pn1080:pvrLenovoIdeaPadU300s:rvnLENOVO:rnU300s:rvr1.0:cvnLENOVO:ct10:cvrLenovoIdeaPadU300s:
  dmi.product.name: 1080
  dmi.product.version: Lenovo IdeaPad U300s
  dmi.sys.vendor: LENOVO

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