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Thread: Dell precision M4700: Wireless failed after ubuntu 12.04 updating

  1. #1
    Join Date
    Feb 2013
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    Angry Dell precision M4700: Wireless failed after ubuntu 12.04 updating

    Hello everybody,

    hope somebody can help.
    I am working on a Dell precision M4700 laptop with Ubuntu 12.04 and KDE desktop.
    After a "suggested" system updating, my wireless connection stops working. KNetWorkManager sees the wireless and tries to connect to it but, after a while, a small windows pops up and asks for a password. If I introduce the wireless one I have it tries again but nothing happens. That window appears again and again asking for a password.
    Such windows has a key as a symbol on the top left corner, the same key appears over the KNetWorkManager symbol which is on the bottom panel. The window has the title "Secretas de [wireless name] - Service for KDE-" (in Spanish sorry ).

    I guess some security measurement has been activated after the updating but I do not know how to deactivate it.

    I am sure the password is correct and the router is working fine, indeed, I am using another laptop to publish this thread using the same wireless connection.

    I also post some useful information:

    kernel: 3.2.0-37-generic
    desktop KDE
    ubuntu 12.04.2 LTS

    iwconfig:

    lo: no wireless extension
    eth1: IEEE 802.11abg ESSID off/any
    Mode: managed access point: not-associated
    Retry long limit:7 RTS thr off Fragment thr off
    power management: off
    eth0: no wireless extension

    Thanks for your support!
    Last edited by rbaena; February 15th, 2013 at 10:33 AM.

  2. #2
    Join Date
    Aug 2005
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    South Carolina, USA
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    Ubuntu 14.10 Utopic Unicorn

    Re: Dell precision M4700: Wireless failed after ubuntu 12.04 updating

    Please see your question at askubuntu.com.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  3. #3
    Join Date
    Jul 2012
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    315
    Distro
    Xubuntu 12.04 Precise Pangolin

    Re: Dell precision M4700: Wireless failed after ubuntu 12.04 updating

    Which is here: http://askubuntu.com/questions/25637...12-04-updating

    Try turning the hardware wireless switch off if you have one? On my Dell Precision M6500 I have to have it on for W7 but off for Xubuntu 12.04.2.
    The best things in life are free, so what are we paying for?

  4. #4
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    Re: Dell precision M4700: Wireless failed after ubuntu 12.04 updating

    Thanks for your answer.
    I do not see any hardware switch to set off the wireless device. Where is it?

  5. #5
    Join Date
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    Ubuntu 14.10 Utopic Unicorn

    Re: Dell precision M4700: Wireless failed after ubuntu 12.04 updating

    Please see #13 attached.
    Attached Images Attached Images
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  6. #6
    Join Date
    Feb 2013
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    Re: Dell precision M4700: Wireless failed after ubuntu 12.04 updating

    Thanks, I tried switching off the button #13 but it does not work either.

  7. #7
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    Ubuntu 14.10 Utopic Unicorn

    Re: Dell precision M4700: Wireless failed after ubuntu 12.04 updating

    Please move the switch to ON and open a terminal and run and post:
    Code:
    rfkill list all
    Move the switch the other way and run and post again:
    Code:
    rfkill list all
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  8. #8
    Join Date
    Feb 2013
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    Re: Dell precision M4700: Wireless failed after ubuntu 12.04 updating

    Hi, I tried the following:

    hardware switch on
    rfkill list all

    0: dell-wifi: Wireless LAN
    Soft blocked: no
    Hard blocked: no
    1: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
    2: brcmwl-0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

    Then, hardware switch off
    rfkill list all
    0: dell-wifi: Wireless LAN
    Soft blocked: yes
    Hard blocked: yes
    1: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
    2: brcmwl-0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

    Finally I set the switch on again.
    The wireless is still not working. It sees the home LAN and tries to connect again and again but it does not.

  9. #9
    Join Date
    Aug 2005
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    Ubuntu 14.10 Utopic Unicorn

    Re: Dell precision M4700: Wireless failed after ubuntu 12.04 updating

    hardware switch on
    rfkill list all

    0: dell-wifi: Wireless LAN
    Soft blocked: no
    Hard blocked: no
    1: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
    2: brcmwl-0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
    At this point, we know the switch is not stopping your wireless. Let's troubleshoot the wireless device itself. Please run and post:
    Code:
    lspci -nn | grep 0280
    The pipe symbol | is on the right side of my US keyboard on the same key with \.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  10. #10
    Join Date
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    Re: Dell precision M4700: Wireless failed after ubuntu 12.04 updating

    Here you are ip a and lpsci -nn | grep 0280

    rbaena@fajnmp2:~/DataPart2/Otros$ lspci -nn | grep 0280

    03:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01)

    rbaena@fajnmp2:~/DataPart2/Otros$ ip a

    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
    valid_lft forever preferred_lft forever
    2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether d4:be:d9:82:0a:99 brd ff:ff:ff:ff:ff:ff
    3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether a4:17:31:4b:52:6e brd ff:ff:ff:ff:ff:ff
    inet6 fe80::a617:31ff:fe4b:526e/64 scope link
    valid_lft forever preferred_lft forever

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