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[Bug 1341068] Re: Intel Corporation Centrino Advanced-N 6235 wifi is slow


The description here isn't very informative. It's slow compared to what?
The same machine booted in Windows? Previous Ubuntu releases?

One probable cause is that transmit aggregation as been enabled by
default for some Intel hardware due to firmware bugs which caused
unstable connections, which will definitely impact performance on
802.11n networks. If you know that your hardware worked fine with a
previous Ubuntu release, or if you just want to see if it helps, you can
boot Ubuntu with the iwlwifi.11n_disable=8 option to force transmit
aggregation to be enabled. If you find this helps and gives you a stable
connection, you can make this option permanent by creating a file named
/etc/modprobe.d/iwlwifi-11n.conf which has the following text:

options iwlwifi 11n_disable=8

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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

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  Intel Corporation Centrino Advanced-N 6235 wifi is slow

Status in “linux” package in Ubuntu:

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
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
   /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
   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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