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Thread: 12.04, cannot detect wireless network after router reset

  1. #1
    Join Date
    Aug 2010
    Beans
    23
    Distro
    Ubuntu 10.04 Lucid Lynx

    Unhappy 12.04, cannot detect wireless network after router reset

    I have an IdeaPad S10e running Ubuntu 12.04 for the past 6 months or so and was using the wireless network without any problems.

    Recently, somebody accidentally switched off the Linksys EA4500 router. After it was turned on again, my Windows 7 computer had no problems reconnecting but the Ubuntu 12.04 system does not detect any available wireless network at all.

    Can anybody offer any specific solutions?

    Thanks in advance.

  2. #2
    Join Date
    Aug 2010
    Beans
    23
    Distro
    Ubuntu 10.04 Lucid Lynx

    12.04, cannot detect wireless network after router reset

    If they help, further details are as follows.

    The output of lshw -c network:
    Code:
    sudo lshw -c network
      *-network               
           description: Ethernet interface
           product: NetLink BCM5906M Fast Ethernet PCI Express
           vendor: Broadcom Corporation
           physical id: 0
           bus info: pci@0000:02:00.0
           logical name: eth0
           version: 02
           serial: 00:23:8b:bf:2f:40
           capacity: 100Mbit/s
           width: 64 bits
           clock: 33MHz
           capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
           configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.121 firmware=sb v3.04 latency=0 link=no multicast=yes port=twisted pair
           resources: irq:44 memory:f0200000-f020ffff
      *-network
           description: Wireless interface
           product: BCM4312 802.11b/g LP-PHY
           vendor: Broadcom Corporation
           physical id: 0
           bus info: pci@0000:05:00.0
           logical name: eth1
           version: 01
           serial: 00:24:2c:e6:28:d9
           width: 64 bits
           clock: 33MHz
           capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
           configuration: broadcast=yes driver=wl0 driverversion=6.20.155.1 (r326264) latency=0 multicast=yes wireless=IEEE 802.11abg
           resources: irq:18 memory:f0400000-f0403fff
    Of ifconfig:
    Code:
    ifconfig
    eth0      Link encap:Ethernet  HWaddr 00:23:8b:bf:2f:40  
              UP BROADCAST MULTICAST  MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
              Interrupt:16 
    
    eth1      Link encap:Ethernet  HWaddr 00:24:2c:e6:28:d9  
              inet6 addr: fe80::224:2cff:fee6:28d9/64 Scope:Link
              UP BROADCAST MULTICAST  MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:25 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
              Interrupt:18 
    
    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:4388 errors:0 dropped:0 overruns:0 frame:0
              TX packets:4388 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:348736 (348.7 KB)  TX bytes:348736 (348.7 KB)
    And of lspci:
    Code:
    lspci
    00:00.0 Host bridge: Intel Corporation Mobile 945GSE Express Memory Controller Hub (rev 03)
    00:02.0 VGA compatible controller: Intel Corporation Mobile 945GSE 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 N10/ICH 7 Family High Definition Audio Controller (rev 02)
    00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 02)
    00:1c.1 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 2 (rev 02)
    00:1c.2 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 3 (rev 02)
    00:1d.0 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #1 (rev 02)
    00:1d.1 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 02)
    00:1d.2 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 02)
    00:1d.3 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 02)
    00:1d.7 USB controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 02)
    00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
    00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
    00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02)
    00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7-M Family) SATA Controller [IDE mode] (rev 02)
    00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 02)
    02:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express (rev 02)
    05:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)

  3. #3
    Join Date
    Mar 2010
    Location
    India
    Beans
    7,198
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: 12.04, cannot detect wireless network after router reset

    Hi,

    I've edited the title for you.
    As for the wireless issue, please follow the "Wireless Script" link in my signature, and post back its result.

    Also, although may sound silly, have you tried resetting your router again? If not, try powering it off > wait for at least half a minute (even 4 if not a problem) > power it on > try connecting again.

    A reboot can often do miracles.

    If you can do so, run the wireless script afterwards.
    Varun
    Help others by marking threads as [SOLVED], if they are. (See how)
    Wireless Script | Use Code Tags

  4. #4
    Join Date
    Feb 2013
    Beans
    2

    Re: 12.04, cannot detect wireless network after router reset

    Rebooting has always worked for me , both laptops and routers
    try that and post results

  5. #5
    Join Date
    Aug 2010
    Beans
    23
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: 12.04, cannot detect wireless network after router reset

    Thanks for fixing the title.

    And yes, I've tried rebooting both, the router and the laptop. Didn't change anything. I shall try again in a couple of hours to check again.

    Am I correct in assuming that the Wireless Script generates a detailed diagnostic report?

  6. #6
    Join Date
    Mar 2010
    Location
    India
    Beans
    7,198
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: 12.04, cannot detect wireless network after router reset

    Quote Originally Posted by newbie.who.needs.help View Post
    Thanks for fixing the title.
    No problem, part of the job

    Am I correct in assuming that the Wireless Script generates a detailed diagnostic report?
    Yes.
    It gives us 'almost' everything needed to troubleshoot most of the wifi issues. Its result (netinfo.txt) is a simple text file which you can check yourself before posting here.
    Varun
    Help others by marking threads as [SOLVED], if they are. (See how)
    Wireless Script | Use Code Tags

  7. #7
    Join Date
    Aug 2010
    Beans
    23
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: 12.04, cannot detect wireless network after router reset

    Ok, sorry for abandoning my own question. Pesky exams...

    The good news is that internet's suddenly working again. For no apparent reason... As always.

    Thanks for all your help guys!

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