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[Mike <pmike2001@xxxxxxxxx>]

This bug is reproducible with lastest kernel (3.13-rc6 at the moment).
Part of syslog with relevant lines attached.

uname -a
>Linux h1 3.13.0-031300rc6-generic #201312291935 SMP Mon Dec 30 00:37:05 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

** Attachment added: "iwlwifi FW error"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1099487/+attachment/3939959/+files/1099487.txt

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

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https://bugs.launchpad.net/bugs/1099487

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

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  This appears to be related to the older bug #200509 on my Lenovo X230.

  Since Jan 4th, I'm seeing errors like:

  Jan  8 14:33:32 lystena kernel: [10462.742627] iwlwifi 0000:03:00.0:
  Microcode SW error detected.  Restarting 0x2000000.

  Running:

  $ sudo modprobe -r iwlwifi; sudo modprobe iwlwifi

  ...fixes the issue. Attached appears to be one of the first instances
  of the issue.

  Kernel upgrade I can see in my apt logs:

  Start-Date: 2012-12-01  07:43:21
  Commandline: aptdaemon role='role-commit-packages' sender=':1.1567'
  Install: linux-image-extra-3.5.0-19-generic:amd64 (3.5.0-19.30), linux-image-3.5.0-19-generic:amd64 (3.5.0-19.30)
  Upgrade: perl:amd64 (5.14.2-13, 5.14.2-13ubuntu0.1), perl-base:amd64 (5.14.2-13, 5.14.2-13ubuntu0.1), libboost-python1.49.0:amd64 (1.49.0-3.1ubuntu1, 1.49.0-3.1ubuntu1.1), perl-modules:amd64 (5.14.2-13, 5.14.2-13ubuntu0.1), libboost-date-time1.49.0:amd64 (1.49.0-3.1ubuntu1, 1.49.0-3.1ubuntu1.1), linux-image-generic:amd64 (3.5.0.18.21, 3.5.0.19.22), libperl5.14:amd64 (5.14.2-13, 5.14.2-13ubuntu0.1), linux-libc-dev:amd64 (3.5.0-18.29, 3.5.0-19.30)

  -21 kernel was installed on the 18th of December.

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