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Thread: Wireless fails after reboot / suspend

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

    Wireless fails after reboot / suspend

    I recently installed Ubuntu 10.04.1 LTS and have it set to dual-boot with windows 7 on my gateway tablet PC. Since installing, sometimes when I suspend or reboot, my wireless does not work. To be more clear - it is working fine, then I either suspend/reboot, then I come back and no wireless networks show up at all. I can still connect with ethernet cable though. I can solve it by rebooting multiple times (usually around 1-5 times) and then it (magically) seems to work again. I have also tried switching from network-manager to wicd, but the problem persists. With both network-manager and wicd, I've tried simulating a reboot for the wireless by using the command 'sudo modprobe -r iwl3945 && sudo modprobe iwl3945' (network-manager) and 'sudo /etc/init.d/wicd restart' (wicd), but these do not seem to work. Any suggestions?

  2. #2
    Join Date
    Dec 2010
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    940

    Re: Wireless fails after reboot / suspend

    Just an idea: Go to System-Administration-Additional Drivers. If there's a different driver for your wireless, it should be in there. Your current driver probably just doesn't work too well with Ubuntu.

  3. #3
    Join Date
    Sep 2008
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    Korea
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    Ubuntu 12.04 Precise Pangolin

    Re: Wireless fails after reboot / suspend

    Please type in the terminal
    Code:
    lshw -C network
    and post the output here. People need to know the card to be able to help you.

  4. #4
    Join Date
    Dec 2010
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    Ubuntu 10.04 Lucid Lynx

    Re: Wireless fails after reboot / suspend

    Thanks for the suggestion - I went to System-Administration-Hardware Drivers and a dialog pops up saying 'Searching for available drivers' and then that goes away and a new dialog pops up saying 'No proprietary drivers are in use on this system' with a couple of empty boxes below the text.

  5. #5
    Join Date
    Dec 2010
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    Ubuntu 10.04 Lucid Lynx

    Re: Wireless fails after reboot / suspend

    Ok I typed sudo lshw -C network and it gave:

    Code:
      *-network               
           description: Ethernet interface
           product: 82566MC Gigabit Network Connection
           vendor: Intel Corporation
           physical id: 19
           bus info: pci@0000:00:19.0
           logical name: eth0
           version: 03
           serial: 00:e0:b8:d0:54:fb
           capacity: 1GB/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=1.0.2-k2 firmware=0.3-0 latency=0 link=no multicast=yes port=twisted pair
           resources: irq:26 memory:f8500000-f851ffff memory:f8524000-f8524fff ioport:1800(size=32)
      *-network
           description: Wireless interface
           product: PRO/Wireless 3945ABG [Golan] Network Connection
           vendor: Intel Corporation
           physical id: 0
           bus info: pci@0000:02:00.0
           logical name: wlan0
           version: 02
           serial: 00:1c:bf:a4:b1:1f
           width: 32 bits
           clock: 33MHz
           capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
           configuration: broadcast=yes driver=iwl3945 ip=192.168.2.6 latency=0 multicast=yes wireless=IEEE 802.11abg
           resources: irq:28 memory:f8100000-f8100fff

  6. #6
    Join Date
    Sep 2008
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    Korea
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    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Wireless fails after reboot / suspend

    What happens if you do
    Code:
    sudo iwlist scan
    in the terminal?

  7. #7
    Join Date
    Dec 2010
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    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Wireless fails after reboot / suspend

    I type 'sudo iwlist scan' at the terminal and get
    Code:
    lo        Interface doesn't support scanning.
    
    eth0      Interface doesn't support scanning.
    
    wlan0     Scan completed :
              Cell 01 - Address: 00:15:D1:8B:22:04
                        Channel:11
                        Frequency:2.462 GHz (Channel 11)
                        Quality=56/70  Signal level=-54 dBm  
                        Encryption key:on
                        ESSID:"wow!459280"
                        Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s
                        Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
                                  36 Mb/s; 48 Mb/s; 54 Mb/s
                        Mode:Master
                        Extra:tsf=00000240a11d41c3
                        Extra: Last beacon: 96ms ago
                        IE: Unknown: 000A776F7721343539323830
                        IE: Unknown: 010482848B96
                        IE: Unknown: 03010B
                        IE: WPA Version 1
                            Group Cipher : TKIP
                            Pairwise Ciphers (1) : TKIP
                            Authentication Suites (1) : PSK
                        IE: Unknown: DD900050F204104A0001101044000102103B00010210470010E7FE1B918CD5031098DD0015D18B22041021000541727269731023000941727269735F35346710240007575053303030311042000E30303031303030303034453034341054000800060050F20400011011002041727269735F3534675F57505300000000000000000000000000000000000000100800020084
                        IE: Unknown: 0406000200000000
                        IE: Unknown: 2A0100
                        IE: Unknown: 32080C1218243048606C
              Cell 02 - Address: 00:13:10:07:D1:92
                        Channel:6
                        Frequency:2.437 GHz (Channel 6)
                        Quality=26/70  Signal level=-84 dBm  
                        Encryption key:off
                        ESSID:"Packers Suck"
                        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:Master
                        Extra:tsf=000000a83cfe8184
                        Extra: Last beacon: 2796ms ago
                        IE: Unknown: 000C5061636B657273205375636B
                        IE: Unknown: 010882848B962430486C
                        IE: Unknown: 030106
                        IE: Unknown: 2A0100
                        IE: Unknown: 2F0100
                        IE: Unknown: 32040C121860
                        IE: Unknown: DD06001018010000
    
    pan0      Interface doesn't support scanning.

    That is while the wireless is working.

  8. #8
    Join Date
    Sep 2008
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    Korea
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    Ubuntu 12.04 Precise Pangolin

    Re: Wireless fails after reboot / suspend

    Can you run both commands and post the output next time when the wireless isn't working? Because it all looks fine from that output that you provided.

  9. #9
    Join Date
    Oct 2009
    Location
    Tucson, AZ
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    782
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Wireless fails after reboot / suspend

    Hi cfd_man! You might try installing updated drivers for your wireless card. To do so, run these commands in a terminal, pressing Enter after each one:
    Code:
    sudo apt-get update
    sudo apt-get install linux-backports-modules-wireless-lucid-generic
    As for you, whitecrow, that broken kernel is most likely your problem. Unfortunately, just booting into a good kernel sometimes isn't enough to get it back working again. Make sure you boot into a good kernel (2.6.35-23-generic works good for me) and run this command for me:
    Code:
    lspci -v
    Copy and paste what that outputs into a new post. It gets really confusing when we try and tackle too many different people's problems in one thread. Hopefully I can get your wireless working again, and I can also tell you how to get rid of that busted kernel so you don't have to switch everytime you boot.

  10. #10
    Join Date
    Dec 2010
    Beans
    23
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Wireless fails after reboot / suspend

    Hi patches,

    Thank you for the help. I did what you said when my wireless failed the last time, and then it worked after 1 restart (it usually takes at least 3) - so the problem seems to be fixed. I will update this forum if the problem persists.

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