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[madbiologist <1341068@xxxxxxxxxxxxxxxxxx>]

This might be fixed in the Ubuntu 15.04 "Vivid Vervet" kernel
3.19.0-17.17 by this commit:

iwlwifi: fix max_ht_ampdu_exponent for older devices

The diff file mentions your Centrino Advanced-N 6235.

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https://bugs.launchpad.net/bugs/1341068

Title:
  Intel Corporation Centrino Advanced-N 6235 wifi is slow

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Intel Corporation Centrino Advanced-N 6235 wifi is slow

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-30-generic 3.13.0-30.55
  ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  orlexy     2126 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Jul 12 10:37:18 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-06-27 (14 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 20042
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic root=UUID=70e21e10-256e-4d84-b19a-6fb393f2b46d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-30-generic N/A
   linux-backports-modules-3.13.0-30-generic  N/A
   linux-firmware                             1.127.4
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/28/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 29CN38WW(V2.15)
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Base Board Product Name
  dmi.board.vendor: LENOVO
  dmi.board.version: Base Board Version
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnLENOVO:bvr29CN38WW(V2.15):bd01/28/2011:svnLENOVO:pn20042:pvrLenovoG560:rvnLENOVO:rnBaseBoardProductName:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.name: 20042
  dmi.product.version: Lenovo G560
  dmi.sys.vendor: LENOVO

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