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


bugzilla.intellinuxwireless.org doesn't exist anymore.

** Changed in: linux
   Importance: Medium => Undecided

** Changed in: linux
       Status: In Progress => New

** Changed in: linux
 Remote watch: bugzilla.intellinuxwireless.org/ #2328 => None

** Tags added: latest-bios-203 needs-upstream-testing regression-

** Tags removed: regression-potential
** Tags added: regression-release

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  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.

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