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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1034740/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
