8086:422c iwlagn module in 11.10 beta2

Bug #871254 reported by Cyril Buquet on 2011-10-09
This bug affects 16 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)

Bug Description

Wireless network error (slow, network stop, ...) with iwlagn module on intel wireless 6200
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6200 (rev 35)

Same workaround solution than previous version :
1) Create /etc/modprobe.d/intel_11n_disable.conf with :
options iwlagn 11n_disable=1

2) sudo update-initramfs -u

3) reboot or sudo modprobe -r iwlagn && sudo modprobe iwlagn

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-12-generic 3.0.0-12.20
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
 /dev/snd/controlC1: cyril 1702 F.... pulseaudio
 /dev/snd/controlC0: cyril 1702 F.... pulseaudio
CRDA: Error: [Errno 2] Aucun fichier ou dossier de ce type
 Card hw:0 'Intel'/'HDA Intel at 0xe9660000 irq 49'
   Mixer name : 'IDT 92HD81B1C5'
   Components : 'HDA:111d76d5,1028040b,00100104'
   Controls : 15
   Simple ctrls : 10
 Card hw:1 'NVidia'/'HDA NVidia at 0xe3080000 irq 17'
   Mixer name : 'Nvidia GPU 0b HDMI/DP'
   Components : 'HDA:10de000b,10de0101,00100200'
   Controls : 16
   Simple ctrls : 4
Date: Sun Oct 9 13:41:29 2011
HibernationDevice: RESUME=UUID=965ea582-8c45-4193-936f-8c84a38a2692
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110922)
MachineType: Dell Inc. Latitude E6510
 Socket 0:
   no product info available
 Socket 0:
   no card
 PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=953bd213-a7ce-487e-a5a4-90d046eef3ae ro quiet splash vt.handoff=7
 Error: command ['pacmd', 'list-sinks'] failed with exit code 1: Home directory /home/cyril not ours.
 No PulseAudio daemon running, or not running as session daemon.
 Error: command ['pacmd', 'list-sources'] failed with exit code 1: Home directory /home/cyril not ours.
 No PulseAudio daemon running, or not running as session daemon.
 linux-restricted-modules-3.0.0-12-generic N/A
 linux-backports-modules-3.0.0-12-generic N/A
 linux-firmware 1.60
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/26/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.asset.tag: OSIATIS-CB
dmi.board.name: 0N5KHN
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.asset.tag: OSIATIS-CB
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA09:bd05/26/2011:svnDellInc.:pnLatitudeE6510:pvr0001:rvnDellInc.:rn0N5KHN:rvrA03:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6510
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.

Cyril Buquet (cyril11) wrote :
Brad Figg (brad-figg) on 2011-10-09
Changed in linux (Ubuntu):
status: New → Confirmed
Paulo J. S. Silva (pjssilva) wrote :

I also can confirm this bug, I have the same wireless card. What is most interesting in my case is that the bug in my wi-fi card exposes a bug in my router (TP-Link TL-WR1043ND with DD-WRT firware) and crashes the router. I have to reboot the router after some minutes of 11n use. I may not be alone as the following thread in ubuntuforums suggests:


So the bug might be very dangerous, with Ubuntu laptops bringing networks down.

Joseph Salisbury (jsalisbury) wrote :

Would it be possible for you to test the latest upstream kernel? It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

tags: added: needs-upstream-testing
Cyril Buquet (cyril11) wrote :

Tested with this kernel (amd64) :
(linux-image-3.1.0-0301rc9-generic_3.1.0-0301rc9.201110050905_amd64.deb + headers)

Same problem.

tags: removed: needs-upstream-testing
Changed in linux (Ubuntu):
status: Confirmed → Triaged
Jorge Gustavo (jgr) wrote :

Same here. I just upgrade to final 11.10 release, and the wireless is really slow.

$ uname -a
Linux cagliari 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

$ lspci | grep -i network
02:00.0 Network controller: Intel Corporation Centrino Advanced-N 6200 (rev 35)

$ sudo ethtool -i wlan2
driver: iwlagn
version: 3.0.0-12-generic
firmware-version: build 25532
bus-info: 0000:02:00.0

The wired connection is ok.
Using an external USB Linksys WUSB100 v2 RangePlus Wireless Network Adapter [Ralink RT3070] is also ok.

The workaround solves this issue (but disabling N support).

Eric G. (eric-baldfury) wrote :

Mainline Kernel 3.1.0-0301rc9.201110050905 appears to have resolved the issue for me.

Paulo J. S. Silva (pjssilva) wrote :

Same here, I have upgrade my laptop to 11.10 and still had problems. After that I upgraded to 3.1.0-0301rc9-generic kernel and the problem seems fixed.

jamespcole (jamespcole) wrote :

Same here but with a slightly different revision of the Intel 6200(rev 3e)

uname -a
Linux user0-lemur 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

lspci | grep -i network
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6200 (rev 3e)

tags: added: kernel-fixed-upstream
ybdjkfd (ybdjkfd) wrote :

DD-WRT relates in addition to the RedHat link above: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=140461&postdays=0&postorder=asc

James Kingdon (james-kingdon) wrote :


Could someone explain how to install 3.1.0-0301rc9-generic onto 11.10 (or point me at instructions). I tried adding the 'precise' repository and installing linux-image, but the result failed to fully boot (no-GUI).


tags: added: kernel-fixed-upstream-v3.1-rc9
removed: kernel-fixed-upstream
Joseph Salisbury (jsalisbury) wrote :

Hi James,

You can download the debs for your specific arch from:

Then install them with dpkg, for example to install 32 bit kernel:

sudo dpkg -i linux-image-3.1.0-0301rc9-generic_3.1.0-0301rc9.201110181311_i386.deb

km (km-mathcs) wrote :

Will there be a patch for the 3.0 kernel that comes with 11.10?

summary: - iwlagn module in 11.10 beta2
+ 8086:422c iwlagn module in 11.10 beta2
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