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[Ubuntu Foundations Team Bug Bot <1305406@xxxxxxxxxxxxxxxxxx>]

** Tags added: patch

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Title:
  [8086:4238] iwlwifi: fail to flush all tx fifo queues Q 0

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I have a Lenovo ThinkPad X201 Tablet with an Intel Centrino Ultimate-N
  6300 AGN wireless card.  Ever since I have upgraded to Ubuntu 13.10
  from Ubuntu 12.10, I keep experiencing this annoying issue on wireless
  networks with multiple APs:  a TX queue gets stuck, and the wireless
  card cannot send any packets.  The Wi-Fi LED constantly flashes, and
  sometimes, it becomes nearly impossible to restart the wireless card
  using Fn+F5.

  The NetworkManager connection is setup as follows:

  SSID:  IllinoisNet
  BSSID:  DA:BE:76:xx:xx:xx
  Security:  WPA/WPA2 Enterprise
  Authentication:  Protected EAP (PEAP)
  CA Certificate:  /etc/ssl/certs/AddTrust_External_Root.pem
  PEAP Version:  Automatic
  Inner Authentication:  MSCHAPv2

  Notice that I have manually specified a BSSID to force the system to
  use only one AP (since I have not found a way to reduce the roaming
  aggressiveness on Intel wireless cards in Linux).

  Attached is the Wireshark log and the syslog output while TX queue 0
  is stuck.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-19-generic 3.11.0-19.33
  ProcVersionSignature: Ubuntu 3.11.0-19.33-generic 3.11.10.5
  Uname: Linux 3.11.0-19-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ron        2599 F.... pulseaudio
  Date: Wed Apr  9 21:36:49 2014
  HibernationDevice: RESUME=UUID=70381092-dbb1-458c-8c5c-68850e61086c
  InstallationDate: Installed on 2013-02-28 (405 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: LENOVO 0831CTO
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-19-generic root=UUID=606d1eed-eeca-4acb-a739-6796a7f7432b ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-19-generic N/A
   linux-backports-modules-3.11.0-19-generic  N/A
   linux-firmware                             1.116.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2014-01-22 (77 days ago)
  dmi.bios.date: 04/26/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET69WW (1.39 )
  dmi.board.name: 0831CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6QET69WW(1.39):bd04/26/2012:svnLENOVO:pn0831CTO:pvrThinkPadX201Tablet:rvnLENOVO:rn0831CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 0831CTO
  dmi.product.version: ThinkPad X201 Tablet
  dmi.sys.vendor: LENOVO

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