Ubuntu 11.10 wireless crashes router

[Tyler Burton]

Recently upgraded from 11.04 to 11.10 but now whenever I connect to my home network via wifi the router actually locks up (drops all network connections, refuses new ones, etc). The only work around I've found is to power cycle the router and use a wired connection.

Router: Cisco Linksys WRT120N with latest firmware version 1.0.06

Additional hardware information from lshw:

    description: Portable Computer
    product: Studio XPS 1640 ()
    vendor: Winbond Electronics
    version: A103
    width: 64 bits
    capabilities: smbios-2.5 dmi-2.5 vsyscall64 vsyscall32
    configuration: administrator_password=disabled boot=normal chassis=portable frontpanel_password=unknown keyboard_password=unknown power-on_password=disabled uuid=44454C4C-3900-1059-8033-C7C04F384B31
  *-core
       description: Motherboard
       product: 0Y536R
       vendor: Winbond Electronics
       physical id: 0
       version: A10
       serial: .G9Y38K1.CN4864398M0275.
     *-firmware
          description: BIOS
          vendor: Winbond Electronics
          physical id: 1
          version: A10
          date: 07/23/2009
          size: 113KiB
          capacity: 1984KiB
          capabilities: pci pnp upgrade shadowing escd cdboot bootselect socketedrom edd int13floppy360 int13floppy1200 int13floppy720 int5printscreen int9keyboard int14serial int17printer int10video acpi usb ls120boot smartbattery biosbootspecification netboot
     *-cpu
          description: CPU
          product: Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz
          vendor: Intel Corp.
          physical id: 5
          bus info: cpu@0
          version: CPU Version
          slot: U2E1
          size: 800MHz
          capacity: 800MHz
          width: 64 bits
          clock: 1066MHz
          capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm ida tpr_shadow vnmi flexpriority cpufreq
          configuration: cores=2 enabledcores=2 threads=2
        *-cache:0
             description: L1 cache
             physical id: 6
             slot: L1 Cache
             size: 64KiB
             capacity: 64KiB
             capabilities: asynchronous internal write-back data
        *-cache:1
             description: L2 cache
             physical id: 7
             slot: L2 Cache
             size: 3MiB
             capacity: 3MiB
             capabilities: burst internal write-back instruction
     *-memory
          description: System Memory
          physical id: 15
          slot: System board or motherboard
          size: 4GiB
        *-bank:0
             description: SODIMM Synchronous 1066 MHz (0.9 ns)
             product: HMT125S6BFR8C-G7
             vendor: Hynix Semiconductor (Hyundai Electronics)
             physical id: 0
             serial: 1E606627
             slot: DIMM_A
             size: 2GiB
             width: 64 bits
             clock: 1066MHz (0.9ns)
        *-bank:1
             description: SODIMM Synchronous 1066 MHz (0.9 ns)
             product: HMT125S6BFR8C-G7
             vendor: Hynix Semiconductor (Hyundai Electronics)
             physical id: 1
             serial: 1E206629
             slot: DIMM_B
             size: 2GiB
             width: 64 bits
             clock: 1066MHz (0.9ns)
     *-pci
          description: Host bridge
          product: Mobile 4 Series Chipset Memory Controller Hub
          vendor: Intel Corporation
          physical id: 100
          bus info: pci@0000:00:00.0
          version: 07
          width: 32 bits
          clock: 33MHz
        *-pci:0
             description: PCI bridge
             product: Mobile 4 Series Chipset PCI Express Graphics Port
             vendor: Intel Corporation
             physical id: 1
             bus info: pci@0000:00:01.0
             version: 07
             width: 32 bits
             clock: 33MHz
             capabilities: pci pm msi pciexpress normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:40 ioport:2000(size=4096) memory:cfe00000-cfefffff ioport:d0000000(size=268435456)
           *-display
                description: VGA compatible controller
                product: ATI Technologies Inc
                vendor: ATI Technologies Inc
                physical id: 0
                bus info: pci@0000:01:00.0
                version: 00
                width: 32 bits
                clock: 33MHz
                capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
                configuration: driver=fglrx_pci latency=0
                resources: irq:50 memory:d0000000-dfffffff ioport:2000(size=256) memory:cfef0000-cfefffff memory:cfe00000-cfe1ffff
           *-multimedia
                description: Audio device
                product: RV710/730
                vendor: ATI Technologies Inc
                physical id: 0.1
                bus info: pci@0000:01:00.1
                version: 00
                width: 32 bits
                clock: 33MHz
                capabilities: pm pciexpress msi bus_master cap_list
                configuration: driver=HDA Intel latency=0
                resources: irq:48 memory:cfeec000-cfeeffff
        *-usb:0
             description: USB Controller
             product: 82801I (ICH9 Family) USB UHCI Controller #4
             vendor: Intel Corporation
             physical id: 1a
             bus info: pci@0000:00:1a.0
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master cap_list
             configuration: driver=uhci_hcd latency=0
             resources: irq:16 ioport:1800(size=32)
        *-usb:1
             description: USB Controller
             product: 82801I (ICH9 Family) USB UHCI Controller #5
             vendor: Intel Corporation
             physical id: 1a.1
             bus info: pci@0000:00:1a.1
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master cap_list
             configuration: driver=uhci_hcd latency=0
             resources: irq:21 ioport:1820(size=32)
        *-usb:2
             description: USB Controller
             product: 82801I (ICH9 Family) USB UHCI Controller #6
             vendor: Intel Corporation
             physical id: 1a.2
             bus info: pci@0000:00:1a.2
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master cap_list
             configuration: driver=uhci_hcd latency=0
             resources: irq:19 ioport:1840(size=32)
        *-usb:3
             description: USB Controller
             product: 82801I (ICH9 Family) USB2 EHCI Controller #2
             vendor: Intel Corporation
             physical id: 1a.7
             bus info: pci@0000:00:1a.7
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci_hcd latency=0
             resources: irq:19 memory:fc404800-fc404bff
        *-multimedia
             description: Audio device
             product: 82801I (ICH9 Family) HD Audio Controller
             vendor: Intel Corporation
             physical id: 1b
             bus info: pci@0000:00:1b.0
             version: 03
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi pciexpress bus_master cap_list
             configuration: driver=HDA Intel latency=0
             resources: irq:47 memory:fc400000-fc403fff
        *-pci:1
             description: PCI bridge
             product: 82801I (ICH9 Family) PCI Express Port 1
             vendor: Intel Corporation
             physical id: 1c
             bus info: pci@0000:00:1c.0
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:41 ioport:3000(size=4096) memory:f6000000-f7ffffff ioport:f0000000(size=33554432)
        *-pci:2
             description: PCI bridge
             product: 82801I (ICH9 Family) PCI Express Port 2
             vendor: Intel Corporation
             physical id: 1c.1
             bus info: pci@0000:00:1c.1
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:42 ioport:4000(size=4096) memory:f8000000-f9ffffff ioport:f2000000(size=33554432)
           *-network DISABLED
                description: Wireless interface
                product: Ultimate N WiFi Link 5300
                vendor: Intel Corporation
                physical id: 0
                bus info: pci@0000:04:00.0
                logical name: wlan0
                version: 00
                serial: 00:21:6a:6a:20:3e
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
                configuration: broadcast=yes driver=iwlagn driverversion=3.0.0-12-generic firmware=8.83.5.1 build 33692 latency=0 link=no multicast=yes wireless=IEEE 802.11abgn
                resources: irq:46 memory:f8000000-f8001fff
        *-pci:3
             description: PCI bridge
             product: 82801I (ICH9 Family) PCI Express Port 4
             vendor: Intel Corporation
             physical id: 1c.3
             bus info: pci@0000:00:1c.3
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:43 ioport:5000(size=4096) memory:fa000000-fbffffff ioport:f4000000(size=33554432)
        *-pci:4
             description: PCI bridge
             product: 82801I (ICH9 Family) PCI Express Port 6
             vendor: Intel Corporation
             physical id: 1c.5
             bus info: pci@0000:00:1c.5
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:44 ioport:6000(size=4096) memory:fc000000-fc0fffff ioport:c0100000(size=2097152)
           *-network
                description: Ethernet interface
                product: NetLink BCM5784M Gigabit Ethernet PCIe
                vendor: Broadcom Corporation
                physical id: 0
                bus info: pci@0000:08:00.0
                logical name: eth0
                version: 10
                serial: 00:22:19:f9:72:31
                size: 100Mbit/s
                capacity: 1Gbit/s
                width: 64 bits
                clock: 33MHz
                capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.119 duplex=full firmware=sb v2.17 ip=192.168.1.102 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
                resources: irq:49 memory:fc000000-fc00ffff
        *-usb:4
             description: USB Controller
             product: 82801I (ICH9 Family) USB UHCI Controller #1
             vendor: Intel Corporation
             physical id: 1d
             bus info: pci@0000:00:1d.0
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master cap_list
             configuration: driver=uhci_hcd latency=0
             resources: irq:23 ioport:1860(size=32)
        *-usb:5
             description: USB Controller
             product: 82801I (ICH9 Family) USB UHCI Controller #2
             vendor: Intel Corporation
             physical id: 1d.1
             bus info: pci@0000:00:1d.1
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master cap_list
             configuration: driver=uhci_hcd latency=0
             resources: irq:19 ioport:1880(size=32)
        *-usb:6
             description: USB Controller
             product: 82801I (ICH9 Family) USB UHCI Controller #3
             vendor: Intel Corporation
             physical id: 1d.2
             bus info: pci@0000:00:1d.2
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master cap_list
             configuration: driver=uhci_hcd latency=0
             resources: irq:18 ioport:18a0(size=32)
        *-usb:7
             description: USB Controller
             product: 82801I (ICH9 Family) USB2 EHCI Controller #1
             vendor: Intel Corporation
             physical id: 1d.7
             bus info: pci@0000:00:1d.7
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci_hcd latency=0
             resources: irq:23 memory:fc404c00-fc404fff
        *-pci:5
             description: PCI bridge
             product: 82801 Mobile PCI Bridge
             vendor: Intel Corporation
             physical id: 1e
             bus info: pci@0000:00:1e.0
             version: 93
             width: 32 bits
             clock: 33MHz
             capabilities: pci subtractive_decode bus_master cap_list
             resources: memory:fc100000-fc1fffff
           *-firewire
                description: FireWire (IEEE 1394)
                product: R5C832 IEEE 1394 Controller
                vendor: Ricoh Co Ltd
                physical id: 1
                bus info: pci@0000:09:01.0
                version: 05
                width: 32 bits
                clock: 33MHz
                capabilities: pm ohci bus_master cap_list
                configuration: driver=firewire_ohci latency=32 maxlatency=4 mingnt=2
                resources: irq:17 memory:fc100000-fc1007ff
           *-generic:0
                description: SD Host controller
                product: R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter
                vendor: Ricoh Co Ltd
                physical id: 1.1
                bus info: pci@0000:09:01.1
                version: 22
                width: 32 bits
                clock: 33MHz
                capabilities: pm bus_master cap_list
                configuration: driver=sdhci-pci latency=64
                resources: irq:18 memory:fc100800-fc1008ff
           *-generic:1 UNCLAIMED
                description: System peripheral
                product: R5C592 Memory Stick Bus Host Adapter
                vendor: Ricoh Co Ltd
                physical id: 1.2
                bus info: pci@0000:09:01.2
                version: 12
                width: 32 bits
                clock: 33MHz
                capabilities: pm bus_master cap_list
                configuration: latency=64
                resources: memory:fc100c00-fc100cff
           *-generic:2
                description: System peripheral
                product: xD-Picture Card Controller
                vendor: Ricoh Co Ltd
                physical id: 1.3
                bus info: pci@0000:09:01.3
                version: 12
                width: 32 bits
                clock: 33MHz
                capabilities: pm bus_master cap_list
                configuration: driver=r852 latency=64
                resources: irq:18 memory:fc101000-fc1010ff
        *-isa
             description: ISA bridge
             product: ICH9M LPC Interface Controller
             vendor: Intel Corporation
             physical id: 1f
             bus info: pci@0000:00:1f.0
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: isa bus_master cap_list
             configuration: latency=0
        *-storage
             description: SATA controller
             product: ICH9M/M-E SATA AHCI Controller
             vendor: Intel Corporation
             physical id: 1f.2
             bus info: pci@0000:00:1f.2
             logical name: scsi0
             logical name: scsi1
             version: 03
             width: 32 bits
             clock: 66MHz
             capabilities: storage msi pm ahci_1.0 bus_master cap_list emulated
             configuration: driver=ahci latency=0
             resources: irq:45 ioport:18f0(size=8) ioport:18e4(size=4) ioport:18e8(size=8) ioport:18e0(size=4) ioport:18c0(size=32) memory:fc404000-fc4047ff
           *-disk
                description: ATA Disk
                product: ST9320423ASG
                vendor: Seagate
                physical id: 0
                bus info: scsi@0:0.0.0
                logical name: /dev/sda
                version: 0002
                serial: 5VH07666
                size: 298GiB (320GB)
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5 signature=000dd8ce
              *-volume:0
                   description: Windows NTFS volume
                   physical id: 1
                   bus info: scsi@0:0.0.0,1
                   logical name: /dev/sda1
                   version: 3.1
                   serial: 5446-e4c6
                   size: 98MiB
                   capacity: 100MiB
                   capabilities: primary ntfs initialized
                   configuration: clustersize=4096 created=2010-01-01 18:08:06 filesystem=ntfs label=System Reserved state=clean
              *-volume:1
                   description: Windows NTFS volume
                   physical id: 2
                   bus info: scsi@0:0.0.0,2
                   logical name: /dev/sda2
                   version: 3.1
                   serial: 1c9a73a7-4c43-de45-adcd-975701e5a1e7
                   size: 97GiB
                   capacity: 97GiB
                   capabilities: primary ntfs initialized
                   configuration: clustersize=4096 created=2010-01-01 18:08:32 filesystem=ntfs state=clean
              *-volume:2
                   description: Extended partition
                   physical id: 3
                   bus info: scsi@0:0.0.0,3
                   logical name: /dev/sda3
                   size: 174GiB
                   capacity: 174GiB
                   capabilities: primary extended partitioned partitioned:extended
                 *-logicalvolume:0
                      description: Linux swap / Solaris partition
                      physical id: 5
                      logical name: /dev/sda5
                      capacity: 3920MiB
                      capabilities: nofs
                 *-logicalvolume:1
                      description: Linux filesystem partition
                      physical id: 6
                      logical name: /dev/sda6
                      logical name: [removed by poster]
                      capacity: 151GiB
                      configuration: mount.fstype=ext4 mount.options=rw,relatime,user_xattr,acl,barrier=1,data=ordered state=mounted
                 *-logicalvolume:2
                      description: Linux filesystem partition
                      physical id: 7
                      logical name: /dev/sda7
                      logical name: /
                      capacity: 19GiB
                      configuration: mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro,user_xattr,acl,barrier=1,data=ordered state=mounted
           *-cdrom
                description: DVD-RAM writer
                product: DVD+-RW TS-T633A
                vendor: TSSTcorp
                physical id: 1
                bus info: scsi@1:0.0.0
                logical name: /dev/cdrom
                logical name: /dev/cdrw
                logical name: /dev/dvd
                logical name: /dev/dvdrw
                logical name: /dev/scd0
                logical name: /dev/sr0
                version: DW10
                capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
                configuration: ansiversion=5 status=open
        *-serial UNCLAIMED
             description: SMBus
             product: 82801I (ICH9 Family) SMBus Controller
             vendor: Intel Corporation
             physical id: 1f.3
             bus info: pci@0000:00:1f.3
             version: 03
             width: 64 bits
             clock: 33MHz
             configuration: latency=0
             resources: memory:c0000000-c00000ff ioport:1c00(size=32)
  *-battery
       product: PANASONIC
       vendor: PANASONIC
       physical id: 1
       slot: System Battery Bay
       capacity: 51000mWh
       configuration: voltage=11.1V
  *-remoteaccess UNCLAIMED
       vendor: Intel
       physical id: 2
       capabilities: outbound
  *-power UNCLAIMED
       description: To Be Defined By O.E.M
       product: To Be Defined By O.E.M
       vendor: To Be Defined By O.E.M
       physical id: 3
       version: 2.50
       serial: To Be Defined By O.E.M
       capacity: 32768mWh

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Michael Phipps (7jvyae9)]

I'm also experiencing this exact error. Is there any info I can provide that will help you identify the problem?

[Aman Chhabra (aman-chhabra1)]

I also ran into this bug. I will post my system info when I can get online. Very frustrating.

[Tyler Burton (tylerburtonca)]

I did manage to find somewhat of a work around on another forum:

echo "options iwlagn 11n_disable=1" | tee /etc/modprobe.d/iwlagn.confg
sudo modprobe -rf iwlagn
sudo modprobe -v iwlagn
sudo service network-manager restart

Alternatively I've read people having success with changing the first line to enable it.

echo "options iwlagn 11n_disable=0" | tee /etc/modprobe.d/iwlagn.confg

[J. Timmer (timmerenator)]

This did the trick for me, but only after setting my wireless router to BG-Mixed mode.

[Justin Waters (justin-waters)]

I'm affected as well. I'm not at my computer right now to get details, but I'm running 11.10 on my System 76 Pangolin PANP5.

* Intel Wireless iwlagn driver
* Router: Buffalo WHR-HP-G300N (with stock DD-WRT-based firmware, updated within the last 6 months)

Using "options iwlagn 11n_disable=1" seems to work, although I get a warning about the file being ignored in the future.

[Tyler Burton (tylerburtonca)]

@timmerenator I forgot to mention that I also did this. I didn't realize the two were related until you pointed it out.

[J. Timmer (timmerenator)]

@tylerburtonca I read about this at this ubuntu forum: http://ubuntuforums.org/showthread.php?t=1849013
I had my Netgear at mixed mode and the thing crashed after a minute, after setting it to BG-mixed mode and doing your solution, things keep working. Also alot of people have these problems running DD-WRT on the routers, I have DD-WRT also. Maybe problems are related to DD-WRT. (see post of Justin)

[J. Timmer (timmerenator)]

Could this relate to our problem as well? https://bugs.launchpad.net/ubuntu/+source/linux/+bug/871254
Some fixed it with a kernel update...?

[m1st0 (m1st0)]

Kernel update seems the better fix even if DD-WRT has a bug since a client should not impose a failure on a router unless the router was the total blame here. My Windows OS doesn't crash my Buffalo WHR-HP-G300H DD-WRT system, so it appears to be in the kernel or iwlagn module.

[m1st0 (m1st0)]

I would say that https://bugs.launchpad.net/ubuntu/+source/linux/+bug/871254 is the real help here.
RedHat relates: https://bugzilla.redhat.com/show_bug.cgi?id=708747#c10
DD-WRT relates: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=140461&postdays=0&postorder=asc

[CPUNeck (caspercpu)]

Took a minute to figure out what was going on. Did fresh install of Ubuntu 11.10 on Dell E6420 with an Intel Ultimate-N 6300 NIC, and the Wifi is not acting right. My router is a Netgear N-600 Dual band router running DD-WRT v24-sp2 (06/14/11) std. Never had a problem with my router before this. I didn't need to change my laptop config because the router has two radio interfaces. I can only use the B/G radio. (Separate SSID's for B/G and N) Seems the Ultimate-N 6300 keeps wanting to call the CRDA to update the world regulatory domain. Then it deauthenticates from my access point, soon after that, my router locks up knocking everyone off of all its interfaces.

[Craig Setera (craigjunk)]

I'm having this same issue on my Dell Studio 1558. I've set the disable option for N and switched my router's N settings to mixed BG per the links in the comments above. I'm still seeing this issue on my router. Does anyone have a full proof way to avoid this problem? I'm willing to flash my router to a newer DDWRT, but reading through that thread it didn't seem like there was necessary any fix on the router side either.

Any insights on the root cause and a solution? Would I be better off using the newly release 3.1 kernel?

[sameh (mfaroukg)]

I have the same problem with my HP EliteBook 630P, but when i reset wireless from keyboard it works

[Craig Setera (craigjunk)]

I went ahead and reverted my Netgear WNDR3300 back to stock firmware and my connection is now stable. I don't know where to place "blame", but I had to get a stable connection and this seems to be working for me for now. Even on my N network.

[Thaxton Mauzy (mauzyj)]

Not sure if there is a solve for this yet, but I'm running into the same problem on a Netgear WPN824v2. Firmware is as up to date as can be for this older router. It is only a B/G router, so no N involved. Upgraded to 11.10 and issue started. I tried the 11n_disable=1 workaround, rebooted and it still didn't work.

I've never reported a bug before (sorry, I'm a newbie), so if you need details on my wireless card, I'll need help pulling those. Sorry!

[Thaxton Mauzy (mauzyj)]

My local details
$uname -a
Linux ubuntu 3.0.0-15-generic #26-Ubuntu SMP Fri Jan 20 17:23:00 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

$lspci
04:08.0 Ethernet controller: Atheros Communications Inc. AR5212/AR5213 Multiprotocol MAC/baseband processor (rev 01)

$sudo ethtool -i wlan0
driver: ath5k
version: 3.0.0-15-generic
firmware-version: N/A
bus-info: 0000:04:08.0
supports-statistics: no
supports-test: no
supports-eeprom-access: no
supports-register-dump: no

[Thaxton Mauzy (mauzyj)]

If anyone still cares, I updated to rc10 and disabled 11n via iwlagn.confg and the wireless is still crashing the router...

$ uname -a
Linux ubuntu 3.1.0-030100rc10-generic #201110200610 SMP Thu Oct 20 10:11:32 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/modprobe.d/iwlagn.conf
options iwlagn 11n_disable=1

[davebenvenuti (davebenvenuti)]

so how's importance still "undecided"?

[Andy (asd64)]

I've got the same issue here, the only fix I've found is to run the router at G speed. It would be nice to run at N speed, I know I could just disable N on the linux box but thats not going to get me N speed. I know this works fine in Backtrack 5 R2, I'm wondering if its an issue w/ the linux kernal ubuntu 11.10 is running. If anyone has found a fix, please share :).

[penalvch (penalvch)]

Tyler Burton, thank you for reporting this bug to Ubuntu. Oneiric reached EOL on May 9, 2013.
See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases

Is this an issue in a supported release? If so, could you please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 875134