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Thread: iwlagn won't do wireless N

  1. #1
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    Ubuntu 10.10 Maverick Meerkat

    Question iwlagn won't do wireless N

    I've got an Intel 1000 Wireless N chip:

    Code:
    03:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000
    It connects to G networks just fine. But will not connect to a Wireless N AP.

    iwconfig suggests it's only doing b/g:

    Code:
    wlan0     IEEE 802.11bg  ESSID:"abeowitz"  
              Mode:Managed  Frequency:2.437 GHz  Access Point: 68:7F:74:9A:F1:30   
              Bit Rate=54 Mb/s   Tx-Power=14 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Encryption key:off
              Power Management:off
              Link Quality=58/70  Signal level=-52 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:0  Invalid misc:0   Missed beacon:0
    Firmware is up to date.

    Code:
    md5sum iwlwifi-1000-3.ucode
    
    df79176a88147862c5fe2b7f81c11711  iwlwifi-1000-3.ucode
    I tried Arch-Linux on this same laptop and got it to do N just fine. Even got up to 130Mb/s in iwconfig output!

    So,

    1) Firmware is good, same as Arch linux
    2) AP is good, others connect fine at N speeds
    3) G connects fine, so not authentication or other logical problem...

    What should I look for?

    Ubuntu 10.10 64 bit

    2.6.35-22-generic
    Last edited by abeowitz; October 11th, 2010 at 05:48 AM.

  2. #2
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    Post Re: iwlagn won't do wireless N

    Code:
    root@abe-U43Jc:~# dmesg | grep -i iwl
    [    3.620032] iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:
    [    3.620035] iwlagn: Copyright(c) 2003-2010 Intel Corporation
    [    3.620150] iwlagn 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
    [    3.620189] iwlagn 0000:03:00.0: setting latency timer to 64
    [    3.620290] iwlagn 0000:03:00.0: Detected Intel(R) Centrino(R) Wireless-N 1000 BGN, REV=0x6C
    [    3.644059] iwlagn 0000:03:00.0: Tunable channels: 13 802.11bg, 0 802.11a channels
    [    3.644433] iwlagn 0000:03:00.0: irq 47 for MSI/MSI-X
    [    3.687821] iwlagn 0000:03:00.0: loaded firmware version 128.50.3.1 build 13488
    [    3.719619] phy0: Selected rate control algorithm 'iwl-agn-rs'

  3. #3
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    Ubuntu Development Release

    Re: iwlagn won't do wireless N

    I have the same issue with a Intel(R) WiFi Link 5100 AGN, it will connect on mixed mode but not on N only
    Ubuntu Québec Loco team
    Étudiant en certificat en informatique à l' UQAM

    Ubuntu 12.04 on Asus G73JW-A1

  4. #4
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    Re: iwlagn won't do wireless N

    I've encountered the same problem on an Intel 5100, once I'd switched my access point to both N and G allowed me to atleast connect again.

    Looking through some old messages from 10.04 I found that a similar note about configurable channels appeared:

    Code:
    ~ # zgrep iwl /var/log/messages.3.gz
    ...
    kernel: [   28.670384] iwlagn 0000:04:00.0: Detected Intel Wireless WiFi Link 5100AGN REV=0x54
    kernel: [   28.728369] iwlagn 0000:04:00.0: Tunable channels: 13 802.11bg, 24 802.11a channels
    kernel: [   31.370171] iwlagn 0000:04:00.0: firmware: requesting iwlwifi-5000-2.ucode
    kernel: [   31.413115] iwlagn 0000:04:00.0: loaded firmware version 8.24.2.12
    Again no N channels mentioned, yet my AP was set to N only and everything worked as expected. It seems that not listing N under "tunable channels" doesn't preclude it from working.

  5. #5
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    Smile Re: iwlagn won't do wireless N

    GOT IT!!!!

    The iwlagn module might have 'n' disabled by accident...

    Code:
    rmmod iwlagn
    
    modprobe iwlagn 11n_disable=0
    Code:
    iwconfig
    
    lo        no wireless extensions.
    
    eth0      no wireless extensions.
    
    vboxnet0  no wireless extensions.
    
    wlan0     IEEE 802.11bgn  ESSID:"abeowitz"  
              Mode:Managed  Frequency:2.437 GHz  Access Point: 68:7F:74:9A:F1:30   
              Bit Rate=135 Mb/s   Tx-Power=14 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Encryption key:off
              Power Management:off
              Link Quality=49/70  Signal level=-61 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:0  Invalid misc:0   Missed beacon:0

  6. #6
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    Lightbulb Re: iwlagn won't do wireless N

    Looks like /etc/modprobe.d/intel-5300-iwlagn-disable11n.conf is our culprit.

    Delete or move this file.

    Code:
    wlan0     IEEE 802.11bgn  ESSID:"abeowitz"  
              Mode:Managed  Frequency:2.437 GHz  Access Point: 68:7F:74:9A:F1:30   
              Bit Rate=150 Mb/s   Tx-Power=14 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Encryption key:off
              Power Management:off
              Link Quality=50/70  Signal level=-60 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:0  Invalid misc:0   Missed beacon:0

  7. #7
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    Re: iwlagn won't do wireless N

    Awesome, it works for me too I have set my router to N only and I connect

    So deleting this file makes it a permanent fix ?
    Ubuntu Québec Loco team
    Étudiant en certificat en informatique à l' UQAM

    Ubuntu 12.04 on Asus G73JW-A1

  8. #8
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    Smile Re: iwlagn won't do wireless N

    Mobidoy,

    Yes, deleting the file is a permanent fix.

    Not sure why it's there to begin with, perhaps cruft leftover from testing or a bug with the 5300.

    -Abe

  9. #9
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    Oct 2010
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    Re: iwlagn won't do wireless N

    Yes, it's a feature and not a bug:

    "802.11n support for the iwlagn driver has been temporarily disabled. Intel is actively working to get this properly fixed up in the firmware. This workaround should be reverted once updated firmware is available."

    Or visit this link: https://bugs.launchpad.net/ubuntu/ma...re/+bug/630748

  10. #10
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    Talking Re: iwlagn won't do wireless N

    Quote Originally Posted by sumerland View Post
    Yes, it's a feature and not a bug:

    "802.11n support for the iwlagn driver has been temporarily disabled. Intel is actively working to get this properly fixed up in the firmware. This workaround should be reverted once updated firmware is available."

    Or visit this link: https://bugs.launchpad.net/ubuntu/ma...re/+bug/630748
    Awesome! Thanks for the info! If I have problems with N, I'll know how to disable then.

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