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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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
** Tags: amd64 apport-bug bios-outdated-1.40 needs-upstream-testing
needs-wifi-debug precise raring staging
--
8086:4238 [Lenovo ThinkPad X201] iwlwifi drops connection when using 802.11n
https://bugs.launchpad.net/bugs/1034740
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