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[Mikhail <944271@xxxxxxxxxxxxxxxxxx>]

I am running Ubuntu 14.04.1 LTS and experiencing this issue (broken wifi
until reconnection, "Microcode SW error detected.  Restarting
0x20000000" in dmesg) on Lenovo G550 which has Intel WiMAX/WiFi Link
5150 with the following configuration: broadcast=yes driver=iwlwifi
driverversion=3.13.0-45-generic firmware=8.24.2.2 ip=192.168.0.16
latency=0 link=yes multicast=yes wireless=IEEE 802.11abg).

After adding "options iwlwifi 11n_disable=1" to
/etc/modprobe.d/iwlwifi.conf and testing for half an hour, the original
issue seems to be gone, although according to dmesg, a "microcode sw
error" is still detected but this time with a different restarting
number: "iwlwifi 0000:04:00.0: Microcode SW error detected.  Restarting
0x82000000." Either way, wifi seems to work better with this workaround.

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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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