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Thread: Faulty wireless connection centrino advanced-N 6230

  1. #1
    Join Date
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    Ubuntu 14.04 Trusty Tahr

    Faulty wireless connection centrino advanced-N 6230

    I am somewhat new to Linux. Installed 64bit ubuntu 12.04 on a Dell XPS 13 i5core. This other thread deals with a related issue on 10.04, I'm nervous about following that advice for 12.04.

    Machine has no problem connecting to my home wifi router, but the network connection freezes shortly afterwards for long periods. Rebooting the machine solves the problem temporarily only.

    Based on other threads, this info should come handy:

    Code:
    sudo lshw -C network
      *-network               
           description: Wireless interface
           product: Centrino Advanced-N 6230
           vendor: Intel Corporation
           physical id: 0
           bus info: pci@0000:02:00.0
           logical name: wlan0
           version: 34
           serial: 88:53:2e:f0:90:74
           width: 64 bits
           clock: 33MHz
           capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
           configuration: broadcast=yes driver=iwlwifi driverversion=3.2.0-26-generic firmware=18.168.6.1 ip=192.168.15.129 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
           resources: irq:47 memory:f0500000-f0501fff
    --------
    sudo ifconfig -a 
    lo        Link encap:Local Loopback  
              inet addr:127.0.0.1  Mask:255.0.0.0
              inet6 addr: ::1/128 Scope:Host
              UP LOOPBACK RUNNING  MTU:16436  Metric:1
              RX packets:1094 errors:0 dropped:0 overruns:0 frame:0
              TX packets:1094 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:139966 (139.9 KB)  TX bytes:139966 (139.9 KB)
    
    wlan0     Link encap:Ethernet  HWaddr 88:53:2e:f0:90:74  
              inet addr:192.168.15.129  Bcast:192.168.15.255  Mask:255.255.255.0
              inet6 addr: fe80::8a53:2eff:fef0:9074/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:23085 errors:0 dropped:0 overruns:0 frame:0
              TX packets:15443 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:27144683 (27.1 MB)  TX bytes:1902828 (1.9 MB)
    ---------
    lo        no wireless extensions.
    
    wlan0     IEEE 802.11abgn  ESSID:"AXTEL-f360"  
              Mode:Managed  Frequency:2.437 GHz  Access Point: 5C:D9:98:FD:F3:60   
              Bit Rate=135 Mb/s   Tx-Power=15 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Encryption key:off
              Power Management:on
              Link Quality=57/70  Signal level=-53 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:50  Invalid misc:582   Missed beacon:0
    ----------
    wlan0     Scan completed :
              Cell 01 - Address: 5C:D9:98:FD:F3:60
                        Channel:6
                        Frequency:2.437 GHz (Channel 6)
                        Quality=57/70  Signal level=-53 dBm  
                        Encryption key:on
                        ESSID:"AXTEL-f360"
                        Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
                                  18 Mb/s; 36 Mb/s; 54 Mb/s
                        Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
                        Mode:Master
                        Extra:tsf=00000018b790415e
                        Extra: Last beacon: 136ms ago
                        IE: Unknown: 000A415854454C2D66333630
                        IE: Unknown: 010882848B961224486C
                        IE: Unknown: 030106
                        IE: Unknown: 2A0100
                        IE: Unknown: 32040C183060
                        IE: Unknown: 2D1AEE1117FF000000010000000000000000000000000C0000000000
                        IE: Unknown: 3D1606050700000000000000000000000000000000000000
                        IE: Unknown: 3E0100
                        IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
                        IE: Unknown: 7F0101
                        IE: Unknown: DD07000C4307000000
                        IE: Unknown: 0706555320010B10
                        IE: Unknown: DD1E00904C33EE1117FF000000010000000000000000000000000C0000000000
                        IE: Unknown: DD1A00904C3406050700000000000000000000000000000000000000
    -----------
    Thank you in advance for your help.

  2. #2
    Join Date
    Feb 2008
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    14,690
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    Re: Faulty wireless connection centrino advanced-N 6230

    Hi, please do:
    Code:
    gksudo gedit /etc/pm/power.d/wireless
    (this will create or edit a configuration file that will override the default powermanagement behavior) and enter the following:
    #!/bin/sh

    Code:
    /sbin/iwconfig wlan0 power off
    above exit0, then save gedit,close.
    Then:
    Code:
    echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
    sudo modprobe -rfv iwlwifi
    sudo modprobe -v iwlwifi
    Reboot
    Thanks

  3. #3
    Join Date
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    Re: Faulty wireless connection centrino advanced-N 6230

    Thanks Wildemanne!
    Code appears to work. Will keep an eye on wifi performance and report in a while.
    Cheers mate.

  4. #4
    Join Date
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    Re: Faulty wireless connection centrino advanced-N 6230

    Hi, if it works please use thread tools at the top of the page to mark the thread solved.
    Thanks

  5. #5
    Join Date
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    Re: Faulty wireless connection centrino advanced-N 6230

    Wifi appears to be running smoothly, thanks to Wildemann.
    For my linux culture, was the problem related to some power-saving mode?

  6. #6
    Join Date
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    Re: Faulty wireless connection centrino advanced-N 6230

    Hi, part of it was a power saving issue, also that driver has issues with hardware encryption so we switched it to software encryption with the second set of commands.
    Thanks

  7. #7
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    Re: Faulty wireless connection centrino advanced-N 6230

    I've been using the machine for over a week and wildmanne39's solution still works wonders. Cheers!

  8. #8
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    Re: Faulty wireless connection centrino advanced-N 6230

    Quote Originally Posted by emagar View Post
    I've been using the machine for over a week and wildmanne39's solution still works wonders. Cheers!
    Do you manage to connect to a speed above 54Mbps? Seems I have to forget about N mode until they fix driver.

    Connection is very unstable for me with the solution provided above - reconnecting every few minutes or so.

  9. #9
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    Re: Faulty wireless connection centrino advanced-N 6230

    Quote Originally Posted by TheGrave View Post
    Do you manage to connect to a speed above 54Mbps? Seems I have to forget about N mode until they fix driver.

    Connection is very unstable for me with the solution provided above - reconnecting every few minutes or so.
    Signal level is never at max, even with computer facing the internet router. But my connection is stable. Don't know how to to check speed of my connection, please advice.

  10. #10
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    Re: Faulty wireless connection centrino advanced-N 6230

    Quote Originally Posted by emagar View Post
    Signal level is never at max, even with computer facing the internet router. But my connection is stable. Don't know how to to check speed of my connection, please advice.
    sudo iwlist wlan0 rate

    It got stable with me as well. Upgrading from 11.04 to 12.04 fixed one issue for me and created 10 000 other ones. This release is FULL of bugs, I can't believe they decided to go with it at this stage, I'd call it a beta best case. Seems like the 6-month development cycle of Ubuntu is too much weight for the developers to carry.

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