kernel-packages team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Did this issue occur in a previous version of Ubuntu, or is this a new
issue?

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.12 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-trusty/

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

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

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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:
  Incomplete

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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