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[csmith <1242724@xxxxxxxxxxxxxxxxxx>]

Strange. From my apt history, I've been running >= 1.79.1 since first
installation (mid-Feb).

I've so far conclusively demonstrated the problem is isolated to linux-
firmware, but I can't tell you which version exactly, because I can't
find the intermediate updates. If you can point me at an historical
archive wth versions 1.79.[146], I can try each in turn and verify for
sure where the problem comes in.

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https://bugs.launchpad.net/bugs/1242724

Title:
  Latest intel wifi firmware results in unstable wifi connection

Status in “linux-firmware” package in Ubuntu:
  New

Bug description:
  Laptop is a Lenovo ThinkPad w530.

  Wireless PCI card:
  csmith@csmith-w530:~$ lspci 
    ...
  03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34)

  
  Downgrading to linux-firmware v1.79 appears to fix the problem, so I suspect the problem was introduced with v1.79.7, as I was previously at v1.79.6 with no problems (note I can't find v1.79.6 anymore.)

  Symptoms include:

  - Frequent wifi drops (mulitple times per minute).
  - Large ping times from other machines (up to >1000ms observed, ~1.3 ms the expected norm).
  - Dropped ping requests.
  - Kernel messages as follows:
    [ 8599.406488] iwlwifi 0000:03:00.0: fail to flush all tx fifo queues

  I find via google frequent references to the above kernel message with
  this device on other distros, so I don't think this is isolated to
  anything ubuntu or thinkpad specific.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-firmware 1.79.7
  ProcVersionSignature: Ubuntu 3.8.0-31.46~precise1-generic 3.8.13.8
  Uname: Linux 3.8.0-31-generic x86_64
  NonfreeKernelModules: zfs zcommon znvpair zavl zunicode
  ApportVersion: 2.0.1-0ubuntu17.5
  Architecture: amd64
  Date: Mon Oct 21 15:13:20 2013
  Dependencies:
   
  InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-firmware
  UpgradeStatus: No upgrade log present (probably fresh install)

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