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[Bug 1420243] Re: iwlwifi + intel 6205 + tp-link 4300: bandwidth changed = host unreachable


Further info: this bug does not occur in every WLAN.

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  iwlwifi + intel 6205 + tp-link 4300: bandwidth changed = host

Status in linux package in Ubuntu:

Bug description:
  when using the combo of Intel 6205N (IBM ThinkPad T430s) and TP-Link
  TL-WDR4300 router there is a problem of sudden loss of connectivity
  after a "bandwidth change" event is registered by wifi module.

  In log:
  Feb 10 13:09:28 lenovo kernel: [1981878.856612] wlan0: AP <redacted> changed bandwidth, new config is 2462 M
  Hz, width 1 (2462/0 MHz)
  Feb 10 13:09:31 lenovo kernel: [1981881.929193] wlan0: AP <redacted> changed bandwidth, new config is 2462 M
  Hz, width 2 (2452/0 MHz)

  After that point no frames are coming from the router. I.e. even ARP
  is not resolving, although the wifi connection seems to look fine in
  NetworkManager. Restarting networking or killing wpa_supplicant solves
  the problem for a while.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-extra-3.13.0-38-generic 3.13.0-38.65
  ProcVersionSignature: Ubuntu 3.13.0-45.74-generic 3.13.11-ckt13
  Uname: Linux 3.13.0-45-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
   /dev/snd/controlC0:  kit        2467 F.... pulseaudio
   country IL:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5150 - 5250 @ 40), (N/A, 23), NO-OUTDOOR
   	(5250 - 5350 @ 40), (N/A, 23), NO-OUTDOOR, DFS
  CurrentDesktop: Unity
  Date: Tue Feb 10 13:19:45 2015
  HibernationDevice: RESUME=UUID=5719e2ac-f0f6-464f-99cf-f732c3ec9606
  InstallationDate: Installed on 2014-01-28 (378 days ago)
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
  MachineType: LENOVO 235389G
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-45-generic.efi.signed root=UUID=0c5e577c-b641-490c-ae43-f88b134fe24a ro quiet splash vt.handoff=7
   linux-restricted-modules-3.13.0-45-generic N/A
   linux-backports-modules-3.13.0-45-generic  N/A
   linux-firmware                             1.127.11
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-09-07 (156 days ago)
  dmi.bios.date: 02/18/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G7ET92WW (2.52 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 235389G
  dmi.board.vendor: LENOVO
  dmi.board.version: Win8 Pro DPK TPG
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG7ET92WW(2.52):bd02/18/2013:svnLENOVO:pn235389G:pvrThinkPadT430s:rvnLENOVO:rn235389G:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 235389G
  dmi.product.version: ThinkPad T430s
  dmi.sys.vendor: LENOVO

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