Page 1 of 2 12 LastLast
Results 1 to 10 of 17

Thread: Ubuntu 12.04 cannot bring up wlan0

  1. #1
    Join Date
    Feb 2013
    Beans
    9

    Question Ubuntu 12.04 cannot bring up wlan0

    When I run command "sudo ifconfig wlan0 up", this shows up:
    SIOCSIFFLAGS: Device or resource busy

    This is what in /etc/network/interfaces:

    auto lo
    iface lo inet loopback
    -----------------------------------------------------------------------------------------------
    These are some output related to wlan0:

    adrian@ubuntu:~$ iwlist scan
    lo Interface doesn't support scanning.
    wmx0 Interface doesn't support scanning.
    wlan0 Failed to read scan data : Network is down
    eth0 Interface doesn't support scanning.

    adrian@ubuntu:~$ sudo lshw -C network
    [sudo] password for adrian:
    *-network
    description: Ethernet interface
    product: 82579LM Gigabit Network Connection
    vendor: Intel Corporation
    physical id: 19
    bus info: pci@0000:00:19.0
    logical name: eth0
    version: 04
    serial: f0:de:f1:dc:ad:70
    size: 1Gbit/s
    capacity: 1Gbit/s
    width: 32 bits
    clock: 33MHz
    capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
    configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=1.5.1-k duplex=full firmware=0.13-3 ip=130.215.23.104 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
    resources: irq:50 memory:f4a00000-f4a1ffff memory:f4a2b000-f4a2bfff ioport:6080(size=32)
    *-network DISABLED
    description: Wireless interface
    product: Centrino Advanced-N + WiMAX 6250
    vendor: Intel Corporation
    physical id: 0
    bus info: pci@0000:03:00.0
    logical name: wlan0
    version: 5e
    serial: 64:80:99:3a:83:40
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
    configuration: broadcast=yes driver=iwlwifi driverversion=3.2.0-29-generic-pae firmware=41.28.5.1 build 33926 latency=0 link=no multicast=yes wireless=IEEE 802.11abgn
    resources: irq:52 memory:f4900000-f4901fff
    *-network
    description: Ethernet interface
    physical id: 2
    bus info: usb@2:1.3
    logical name: wmx0
    serial: 00:1d:e1:49:a9:1d
    capabilities: ethernet physical
    configuration: driver=i2400m firmware=i6050-fw-usb-1.5.sbcf link=no

    adrian@ubuntu:~$ rfkill list all
    0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
    1: tpacpi_bluetooth_sw: Bluetooth
    Soft blocked: no
    Hard blocked: no
    2: i2400m-usb:2-1.3:1.0: WiMAX
    Soft blocked: no
    Hard blocked: no
    3: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

    adrian@ubuntu:~$ dmesg | grep iwl
    [ 5.522710] iwlwifi 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
    [ 5.522741] iwlwifi 0000:03:00.0: setting latency timer to 64
    [ 5.522783] iwlwifi 0000:03:00.0: pci_resource_len = 0x00002000
    [ 5.522785] iwlwifi 0000:03:00.0: pci_resource_base = f8540000
    [ 5.522787] iwlwifi 0000:03:00.0: HW Revision ID = 0x5E
    [ 5.523266] iwlwifi 0000:03:00.0: irq 53 for MSI/MSI-X
    [ 5.523399] iwlwifi 0000:03:00.0: Detected Intel(R) Centrino(R) Advanced-N + WiMAX 6250 AGN, REV=0x84
    [ 5.523530] iwlwifi 0000:03:00.0: L1 Enabled; Disabling L0S
    [ 5.534106] iwlwifi 0000:03:00.0: device EEPROM VER=0x540, CALIB=0x6
    [ 5.534109] iwlwifi 0000:03:00.0: Device SKU: 0X1f0
    [ 5.536337] iwlwifi 0000:03:00.0: Tunable channels: 13 802.11bg, 24 802.11a channels
    [ 5.585176] iwlwifi 0000:03:00.0: loaded firmware version 41.28.5.1 build 33926
    [ 5.587817] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
    [ 6.344593] iwlwifi 0000:03:00.0: L1 Enabled; Disabling L0S
    [ 6.344783] iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
    [ 6.589745] iwlwifi 0000:03:00.0: L1 Enabled; Disabling L0S
    [ 6.589923] iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
    -----------------------------------------------------------------------------------------------------------------------
    Can anyone help me to solve this problem?
    Thanks in advance!
    Last edited by quan1992; February 27th, 2013 at 05:00 AM.

  2. #2
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    19,882
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Ubuntu 12.04 cannot bring up wlan0

    May we see:
    Code:
    rfkill list all
    Thanks.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  3. #3
    Join Date
    Feb 2013
    Beans
    9

    Re: Ubuntu 12.04 cannot bring up wlan0

    Quote Originally Posted by chili555 View Post
    May we see:
    Code:
    rfkill list all
    Thanks.
    Hi, chili555, I updated the question. Thanks for your reply!!!

  4. #4
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    19,882
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Ubuntu 12.04 cannot bring up wlan0

    If it's not the wireless switch, we wonder why the wireless is disabled:
    *-network DISABLED
    description: Wireless interface
    product: Centrino Advanced-N + WiMAX 6250
    vendor: Intel Corporation
    physical id: 0
    bus info: pci@0000:03:00.0
    logical name: wlan0
    Network Manager is designed to disallow wireless if you have wired, and you do. Please temporarily detach the ethernet and then run and post:
    Code:
    dmesg | grep iwl
    Thanks.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  5. #5
    Join Date
    Feb 2013
    Beans
    9

    Re: Ubuntu 12.04 cannot bring up wlan0

    Hi, I updated the output of dmesg | grep iwl

    I found that I can connect with infrastructure, but I cannot connect with ad-hoc wireless.

  6. #6
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    19,882
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Ubuntu 12.04 cannot bring up wlan0

    I found that I can connect with infrastructure, but I cannot connect with ad-hoc wireless.
    'Infrastructure' is for computer-to-router or other access point. 'Ad hoc' is for computer-to-computer. Isn't Infrastructure what you want? Aren't you trying to connect to a router and through it, to the internet?
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  7. #7
    Join Date
    Feb 2013
    Beans
    9

    Re: Ubuntu 12.04 cannot bring up wlan0

    Quote Originally Posted by chili555 View Post
    'Infrastructure' is for computer-to-router or other access point. 'Ad hoc' is for computer-to-computer. Isn't Infrastructure what you want? Aren't you trying to connect to a router and through it, to the internet?
    For some reason, my single board computer can only create ad-hoc wirelss right now. So I want my laptop to connect to this ad-hoc network. Does driver of Ubuntu12.04 has the ability to connect to ad-hoc network? My friends computer running on Ubuntu11.04 can connect to it.

  8. #8
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    19,882
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Ubuntu 12.04 cannot bring up wlan0

    Does driver of Ubuntu12.04 has the ability to connect to ad-hoc network?
    Usually, yes. Edit connections in Network Manager and select Ad Hoc. You'll need to specify the BSSID of the station you are connecting to.
    Last edited by chili555; February 27th, 2013 at 03:28 PM.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  9. #9
    Join Date
    Feb 2013
    Beans
    9

    Re: Ubuntu 12.04 cannot bring up wlan0

    Quote Originally Posted by chili555 View Post
    Usually, yes. Edit connections in Network Manager and select Ad Hoc. You'll need to specify the BSSID of the station you are connecting to.
    Is BSSID the MAC address of the single board computer showed by "iwconfig"? I tried to select Ad Hoc in network connections and type the MAC address of wlan1 of single board computer. Unfortunately, it still doesn't work.

    I noticed that before I try to connect to ad-hoc created by single board computer, I can see wlan0 by typing "ifconfig". But after I try to connect to ad-hoc(doesn't succeed), wlan0 simply disappear in output of "ifconfig".

    Do you know why that happened?

  10. #10
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    19,882
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Ubuntu 12.04 cannot bring up wlan0

    Is BSSID the MAC address of the single board computer showed by "iwconfig"?
    BSSID is the station name. If, from your laptop, you scan:
    Code:
    sudo iwlist wlan0 scan
    Do you see the single-board advertising its network?
    Cell 02 - Address: 8x:1B:5E:42:75:xx
    Channel:6
    Frequency:2.437 GHz (Channel 6)
    Quality=23/70 Signal level=-87 dBm
    Encryption key:on
    BSSID:"rweathers"
    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
    24 Mb/s; 36 Mb/s; 54 Mb/s
    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
    Mode:Ad Hoc
    In this example, the BSSID you need to fill in is rweathers.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

Page 1 of 2 12 LastLast

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •