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Thread: Centrino Wireless-N not working

  1. #1
    Join Date
    May 2007
    Beans
    7

    Centrino Wireless-N not working

    Hi,
    I've just updated my HP Pavilion laptop to 11.04, and my wireless has stopped working. I don't appear to be able to detect any wireless networks. The wireless card switch is a touch-type lighted button - when I press it, nothing happens whereas in Windows it changes colour to show it is on/off. It used to blink in the previous Ubuntu installation when it was working. The output of lspci-v for my wireless card is:

    02:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000
    Subsystem: Intel Corporation Centrino Wireless-N 1000 BGN
    Flags: bus master, fast devsel, latency 0, IRQ 48
    Memory at d9000000 (64-bit, non-prefetchable) [size=8K]
    Capabilities: <access denied>
    Kernel driver in use: iwlagn
    Kernel modules: iwlagn
    I'm no linux expert, so please let me know what other info/outputs you might need to help. I appreciate it!

  2. #2
    Join Date
    May 2011
    Beans
    1

    Re: Centrino Wireless-N not working

    Same problem to my laptop (lenovo y560)!
    Anyone please help?

  3. #3
    Join Date
    May 2007
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    7

    Re: Centrino Wireless-N not working

    Update: my card seems to be working fine now. I can turn it on and off in Ubuntu and it acts as it should. I have no idea why...

    I had logged in to Windows and turned the card on, then rebooted and logged back in to Ubuntu and now everything seems to be working properly.

  4. #4
    Join Date
    Aug 2009
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    United States
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    4,459
    Distro
    Ubuntu Development Release

    Re: Centrino Wireless-N not working

    02:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000
    Subsystem: Intel Corporation Centrino Wireless-N 1000 BGN
    Flags: bus master, fast devsel, latency 0, IRQ 48
    Memory at d9000000 (64-bit, non-prefetchable) [size=8K]
    Capabilities: <access denied>
    Kernel driver in use: iwlagn
    Kernel modules: iwlagn
    The wireless driver iwlagn for that intel card works fine in G but will not work if you
    as an N card. If you try to use N it will slowly lose connection or just go real slow.
    You can check in /etc/modprobe.d for a config file if having connection problems. If
    need a config file to make card usable see below: intell 5300 will work if already there also.
    This is a must for 11.04 with Intel Centrino wireless N 1000 if router set to work
    at N speeds at mixed 20 and 40 mhz or just 40 mhz. If no other installs can just set router at G speeds and 20 mhz and will work fine without config file.

    Fix is to make a config file and put this in.
    Code:
    gksudo gedit /etc/modprobe.d/iwlagn.conf
    Now put this line in and close and reboot.
    Code:
    options iwlagn 11n_disable50=1 11n_disable=1
    Makes the card just use the G capabilities in Linux.
    If you dual boot can still run at 144 mb/s or N in windows.
    Can run at 54 mb/s in linux (still plenty fast enough)
    If anyone wants to know if they have N running in this card run
    Code:
    iwconfig
    and N should not show up. Such as:
    IEEE 802.11bg ESSID:"Home" (notice no n just bg)
    Mode:Managed Frequency:2.412 GHz Access Point: C0:C1:C0:C6:0A:EC
    Bit Rate=1 Mb/s Tx-Power=14 dBm
    Retry long limit:7 RTS thr off Fragment thr off
    Power Management off
    Link Quality=52/70 Signal level=-58 dBm
    Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid f rag:0
    Tx excessive retries:0 Invalid misc:0 Missed beacon:0
    Last edited by garvinrick4; May 16th, 2011 at 06:46 AM.
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  5. #5
    Join Date
    Jun 2011
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    2

    Question Re: Centrino Wireless-N not working

    .
    Last edited by smirarab; June 13th, 2011 at 12:19 AM.

  6. #6
    Join Date
    Jun 2011
    Beans
    2

    Re: Centrino Wireless-N not working

    Thanks for the reply. I was facing the same problem and your suggested solution of turning N mode off solved my problem.

    Just wondering though, when you say
    "If no other installs can just set router at G speeds ..." what do you mean by "no other installs"?

    Basically, I am wondering if there is a way to keep the wireless card running in the N mode and still make it compatible with 11.04?

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