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[Mikhail <944271@xxxxxxxxxxxxxxxxxx>]

I was too fast to post previous message after some 10 minutes of
testing. However a recent driver upgrade from 3.13.0-45-generic to
3.13.0-46-generic (with the same firmware) has apparently solved this
issue for me. At least, dmesg does not contain such errors after an hour
of heavy network usage and the network seems to be stable. The version
numbers above are the ones reported by lshw for my wifi card.

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https://bugs.launchpad.net/bugs/944271

Title:
  iwlwifi: Microcode SW error detected.  Restarting 0x2000000

Status in The Linux Kernel:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released

Bug description:
  My Intel Centrino Wireless-N 130 wifi disconnects frequently and can't
  even connect sometimes.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-17-generic 3.2.0-17.27
  ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
  Uname: Linux 3.2.0-17-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.93-0ubuntu2
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  munzir     2153 F.... pulseaudio
   /dev/snd/controlC0:  munzir     2153 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf6300000 irq 54'
     Mixer name	: 'Realtek ALC892'
     Components	: 'HDA:10ec0892,1462106f,00100302'
     Controls      : 34
     Simple ctrls  : 17
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xf6080000 irq 17'
     Mixer name	: 'Nvidia GPU 15 HDMI/DP'
     Components	: 'HDA:10de0015,10de0101,00100100'
     Controls      : 24
     Simple ctrls  : 4
  Date: Thu Mar  1 22:33:24 2012
  HibernationDevice: RESUME=UUID=0432dc88-0889-43b3-86ab-cc09034bdcac
  InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120225)
  MachineType: Micro-Star International Co., Ltd. GT680R/GX680R/GT683R/GT683DXR/GX660DXR
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-17-generic root=UUID=98c64fb8-4f56-4f8b-a19a-f4c917c1548a ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-17-generic N/A
   linux-backports-modules-3.2.0-17-generic  N/A
   linux-firmware                            1.71
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  StagingDrivers: rts5139 mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/01/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: E16F2IMS V3.0U
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: MS-16F2
  dmi.board.vendor: Micro-Star International Co., Ltd.
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 10
  dmi.chassis.vendor: Micro-Star International
  dmi.chassis.version: To be filled by O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrE16F2IMSV3.0U:bd09/01/2011:svnMicro-StarInternationalCo.,Ltd.:pnGT680R/GX680R/GT683R/GT683DXR/GX660DXR:pvrTobefilledbyO.E.M.:rvnMicro-StarInternationalCo.,Ltd.:rnMS-16F2:rvrTobefilledbyO.E.M.:cvnMicro-StarInternational:ct10:cvrTobefilledbyO.E.M.:
  dmi.product.name: GT680R/GX680R/GT683R/GT683DXR/GX660DXR
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Micro-Star International Co., Ltd.

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