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Thread: Unable to scan Wifi networks?

  1. #1
    Join Date
    May 2008
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    7

    Unable to scan Wifi networks?

    I am using ubuntu linux 8.04 Hardy Heron on my laptop HP Compaq NX7300. I am not able to scan wireless network in my area.

    I tried using the command sudo iwlist eth0 scan
    and i got the error Interface doesn't support scanning.

    I tried some research on the web myself and still cant figure the problem.

    https://help.ubuntu.com/community/Wi.../bcm43xx/Hardy

    Plz help!

  2. #2
    Join Date
    Mar 2008
    Beans
    917

    Re: Unable to scan Wifi networks?

    Heres a list from compaq of your possible wifi cards that could come with that model

    Intel PRO/Wireless 3945ABG Network Connection Intel Centrino mobile technology
    Integrated support for 802.11a, b and g
    Up to 54-mbps data rate

    Intel PRO/Wireless 3945BG Network Connection Intel Centrino mobile technology
    Integrated support for 802.11b and g
    Up to 54-mbps data rate

    Broadcom 4311AG WiFi Adapter Integrated support for 802.11a, b and g
    Up to 54-mbps data rate

    Broadcom 4311BG WiFi Adapter Integrated support for 802.11 b and g
    Up to 54-mbps data rate


    Do you know which one you have as the support page for the model you list says its optional? try posting the output of "lspci" without quotes as that might shed some light on this for all of us here to help you.

  3. #3
    Join Date
    May 2008
    Beans
    7

    Re: Unable to scan Wifi networks?

    This is the output I got from lspci

    00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
    00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
    00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
    00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
    00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01)
    00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 01)
    00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 4 (rev 01)
    00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 01)
    00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 01)
    00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 01)
    00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 01)
    00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01)
    00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e1)
    00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 01)
    00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 01)
    02:06.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
    02:06.1 FireWire (IEEE 1394): Texas Instruments PCIxx12 OHCI Compliant IEEE 1394 Host Controller
    02:0e.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
    10:00.0 Network controller: Broadcom Corporation BCM94311MCG wlan mini-PCI (rev 01)

  4. #4
    Join Date
    May 2008
    Beans
    7

    Re: Unable to scan Wifi networks?

    I am facing some graphical problem in Hardy;
    Like when I installed hardy with full graphics, the text and asterisk in username & password field are far more bigger than the text field. Even the shutdown, logoff, etc., buttons in options in the log on screen and magnified.

    To get rid of this stupid magnification i installed hardy with normal graphics but i done i get weird looks during the boot up process.

    I want to know is it Hardy safe with my laptop.

    Hardy is BY FAR the worst Ubuntu version yet. LOCKUP WARNING!!!
    http://ubuntuforums.org/showthread.p...highlight=wifi

    is it really safe?

  5. #5
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    20,131
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Unable to scan Wifi networks?

    eth0 is probably your ethernet, wired connection. Open a terminal and do:
    Code:
    iwconfig
    and see if eth1 or wlan0 isn't your wireless interface. Then do:
    Code:
    sudo iwlist wlan0 scan
    or whatever you found.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  6. #6
    Join Date
    May 2008
    Beans
    7

    Re: Unable to scan Wifi networks?

    its wlan0

    I tried this command
    sudo iwlist wlan0 scan

    and it says wlan0 does not support scanning, network is down

  7. #7
    Join Date
    Apr 2008
    Beans
    17

    Re: Unable to scan Wifi networks?

    I am facing the same problem after upgrading from Ubuntu7 to u8. When I use the 'network-admin'-tool the list of wifi-networks is empty. However, if I first boot with the old kernel (2.6.22-14) I can choose the wifi-network (using network-admin) that I want - and that network will work after I reboot with the new kernel.

    I'm using a Fujitsu Siemens Amilo Pro v3505 laptop with the Intel PRO/Wireless 3945ABG wifi-card.

    Best regards.
    -Mads

  8. #8
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    20,131
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Unable to scan Wifi networks?

    @kmads-

    Did you apply this fix listed in dozens of posts here related to iwl3945?
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  9. #9
    Join Date
    Apr 2008
    Beans
    17

    Re: Unable to scan Wifi networks?

    Quote Originally Posted by chili555 View Post
    @kmads-

    Did you apply this fix listed in dozens of posts here related to iwl3945?
    I might not have. What fix are you refering to?

    Thanks,
    Mads

  10. #10
    Join Date
    Apr 2007
    Location
    Mount Horeb, WI
    Beans
    4,312
    Distro
    Kubuntu Development Release

    Re: Unable to scan Wifi networks?

    Quote Originally Posted by ashish25 View Post
    its wlan0

    I tried this command
    sudo iwlist wlan0 scan

    and it says wlan0 does not support scanning, network is down
    Can you post your lshw -C network? It will help us see what driver it is trying to use (if any).

    The Broadcom cards needs to have either the firmware installed (b43-fwcutter) or use NDISwrapper. If you don't know, can you post:
    Code:
    ls /lib/firmware
    ndiswrapper -v
    ndiswrapper -l
    If there is firmware installed, it will be found in /lib/firmware. The last to options will see what version of ndiswrapper is installed and what driver it is trying to use.

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