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[JD Rogers <1034740@xxxxxxxxxxxxxxxxxx>]

I know this bug is old, but I think I'm having similar problems, and I
would love to make some progress on this.

My problem is a little different, so I may need to file a new bug
(Christopher?). While Alexander's bug appears to connect and then slow
down eventually failing with packet loss, my problem is almost the
opposite. If I can connect, it seems to work fine indefinitely, but
initial connections (after suspend, or right after a reboot) only
occasionally works. Sometimes, if I wait long enough the connection
starts working after several minutes, sometimes it works if I turn off
wireless and turn it back on, but often it just never works.

My intel wireless "Intel Corporation Centrino Ultimate-N 6300 (rev 3e)"
works fine on 802.11g networks. When using 802.11n, not so much.

The worst part is that I am at a loss on what is actually failing.
iwconfig reports that I am associated. No obvious errors in dmesg or
syslog. Yet if I try to ping my access point, I get "network is
unreachable".

# dmesg |tail
[101704.467324] iwlwifi 0000:03:00.0: L1 Enabled; Disabling L0S
[101704.474053] iwlwifi 0000:03:00.0: Radio type=0x0-0x3-0x1
[101704.621429] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[101704.717787] wlan0: authenticate with xx:xx:xx:xx:xx:xx
[101704.780532] wlan0: send auth to xx:xx:xx:xx:xx:xx (try 1/3)
[101704.793246] wlan0: authenticated
[101704.797390] wlan0: associate with xx:xx:xx:xx:xx:xx (try 1/3)
[101704.798226] wlan0: RX AssocResp from xx:xx:xx:xx:xx:xx (capab=0x1011 status=0 aid=1)
[101704.802300] wlan0: associated
[101704.802347] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready

If I load the iwlwifi module using "11n_disable=1" everything works
fine, but then I don't get 802.11n speed. The problem exists on my home
router and on a commercial router at work.

# uname -a
Linux zem 3.11.0-15-generic #25-Ubuntu SMP Thu Jan 30 17:22:01 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/1034740

Title:
  8086:4238 [Lenovo ThinkPad X201] iwlwifi drops connection when using
  802.11n

Status in The Linux Kernel:
  New
Status in “linux” package in Ubuntu:
  Incomplete
Status in “linux” package in Debian:
  New
Status in Fedora:
  Unknown

Bug description:
  Symptoms: After a few minutes, the WiFi connection to my home router
  first becomes slow (packet loss), then entirely unusable. NetWork
  manager still shows the connection as up and working.

  dmesg shows messages like these:
  Aug  9 06:17:16 thinkpad kernel: [ 5026.531127] iwlwifi 0000:02:00.0: Tx aggrega
  tion enabled on ra = b0:48:7a:d6:91:50 tid = 6

  WORKAROUND: rfkill to disable and enable WiFi, or add:
  options iwlwifi 11n_disable=1

  to /etc/modprobe.d/iwlwifi.conf

  However, this means that all my network connections will only run in 802.11a/g mode, which is undesirably slow. Other people using MacOS in my place don't observe any issues, so I can rule out the router(s) as the culprits.
  Hardware: 02:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 35)
  Routers: TP-Link WR1043ND, WR2543ND using OpenWRT trunk.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-27-generic 3.2.0-27.43
  ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
  Uname: Linux 3.2.0-27-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu12
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC29: alex       2261 F.... xfce4-volumed
   /dev/snd/controlC0:  alex       2250 F.... pulseaudio
                        alex       2261 F.... xfce4-volumed
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf2520000 irq 44'
     Mixer name	: 'Intel IbexPeak HDMI'
     Components	: 'HDA:14f15069,17aa2155,00100302 HDA:80862804,17aa21b5,00100000'
     Controls      : 14
     Simple ctrls  : 6
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 6QHT33WW-1.14'
     Mixer name	: 'ThinkPad EC 6QHT33WW-1.14'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Thu Aug  9 12:24:19 2012
  HibernationDevice: RESUME=UUID=9fee4cfb-53b9-43d7-8425-1666aff145c4
  InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: LENOVO 3626A14
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-27-generic root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-27-generic N/A
   linux-backports-modules-3.2.0-27-generic  N/A
   linux-firmware                            1.79
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/26/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET69WW (1.39 )
  dmi.board.name: 3626A14
  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:pn3626A14:pvrThinkPadX201:rvnLENOVO:rn3626A14:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 3626A14
  dmi.product.version: ThinkPad X201
  dmi.sys.vendor: LENOVO

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