Comment 0 for bug 1034740

Maybe related to

https://bugzilla.redhat.com/show_bug.cgi?id=785239

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

Quick workaround is to use rfkill to disable and enable WiFi. Long-term workaround is mentioned in bugzilla bug above, to put

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.

Hardware:

02:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 35)

Routers: TP-Link WR1043ND, WR2543ND using OpenWRT trunk.

Other people using MacOS in my place don't observe any issues, so I can rule out the router(s) as the culprits.

Alex

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