← Back to team overview

kernel-packages team mailing list archive

[Bug 994104] Re: Wireless performance issues on kernel 3.4.0-1-generic (iwlwifi)


Vikrant, this bug was reported a while ago and there hasn't been any
activity in it recently. We were wondering if this is still an issue? If
so, could you please test for this with the latest development release
of Ubuntu? ISO images are available from http://cdimage.ubuntu.com
/daily-live/current/ .

If it remains an issue, could you please run the following command in
the development release from a Terminal
(Applications->Accessories->Terminal), as it will automatically gather
and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available (not the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:

where VERSION-NUMBER is the version number of the kernel you tested. For example:

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:

If the mainline kernel does not fix this bug, please add the following tags:

As well, please remove the tag:

Once testing of the upstream kernel is complete, please mark this bug's
Status as Confirmed. Please let us know your results. Thank you for your

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

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  Wireless performance issues on kernel 3.4.0-1-generic (iwlwifi)

Status in The Linux Kernel:
Status in “linux” package in Ubuntu:

Bug description:
  I was expecting this to happen but was too lazy on reporting issues on
  mainline kernels earlier. But now since the 3.4 kernels has made it to
  quantal repos, I am affected by it.

  The issue is that on 3.4 kernels (I have tried all mainline kernels
  RC1 to RC5), my wireless performance goes for toss.

  I am attaching a screenshot as well on current wireless signal. At
  same location on my previous precise kernel  ( the
  connection speed is around 52 mpbs (average), but on this kernel the
  connection is very unstable. As I connect (or when system starts up),
  the connection speed is like 40mbps, and this degrades in a minute or
  so to 19 mbps, then to 6 mbps and eventually connection becomes
  crazily slow on 1 mbps.

  This is reproducible every time.

  Hopefully, apport has collected enough information but I will try to
  provide some more info as part of description.

  $ lspci -v

  03:00.0 Network controller: Intel Corporation Centrino Wireless-N + WiMAX 6150 (rev 67)
          Subsystem: Intel Corporation Centrino Wireless-N + WiMAX 6150 BGN
          Flags: bus master, fast devsel, latency 0, IRQ 48
          Memory at f5600000 (64-bit, non-prefetchable) [size=8K]
          Capabilities: <access denied>
          Kernel driver in use: iwlwifi
          Kernel modules: iwlwifi

  Let me know what information I can provide to get help resolve this
  blocking issue, which wont let me try/test kernel 3.4 further.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.4.0-1-generic 3.4.0-1.3
  ProcVersionSignature: Ubuntu 3.4.0-1.3-generic 3.4.0-rc5
  Uname: Linux 3.4.0-1-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   /dev/snd/controlC1:  kx         2169 F.... pulseaudio
   /dev/snd/controlC0:  kx         2169 F.... pulseaudio
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf6a00000 irq 49'
     Mixer name	: 'Realtek ALC269VB'
     Components	: 'HDA:10ec0269,10431b33,00100100'
     Controls      : 24
     Simple ctrls  : 13
   Card hw:1 'NVidia'/'HDA NVidia at 0xf4080000 irq 17'
     Mixer name	: 'Nvidia GPU 15 HDMI/DP'
     Components	: 'HDA:10de0015,10de0101,00100100'
     Controls      : 24
     Simple ctrls  : 4
  Date: Thu May  3 22:20:25 2012
  InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
  MachineType: ASUSTeK Computer Inc. G74Sx
   PATH=(custom, user)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.4.0-1-generic root=UUID=ad1c5163-5aee-4c62-8395-af61ae2995a7 ro quiet splash vt.handoff=7
   linux-restricted-modules-3.4.0-1-generic N/A
   linux-backports-modules-3.4.0-1-generic  N/A
   linux-firmware                           1.80
  SourcePackage: linux
  StagingDrivers: rts5139 mei
  UpgradeStatus: Upgraded to quantal on 2011-11-17 (167 days ago)
  dmi.bios.date: 09/23/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: G74Sx.203
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: G74Sx
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrG74Sx.203:bd09/23/2011:svnASUSTeKComputerInc.:pnG74Sx:pvr1.0:rvnASUSTeKComputerInc.:rnG74Sx:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: G74Sx
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

To manage notifications about this bug go to: