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Thread: WiFi in 12.04 works, stops working, requires reboot

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    WiFi in 12.04 works, stops working, requires reboot

    I am running Ubuntu 12.04 on an Acer Aspire 1810t with an Intel 5100 AGN wifi card that has performed flawlessly on Ubuntu 10.04. I assumed the stellar wireless support would continue with 12.04 but have run into a glitch that is a showstopper: wireless works as expected at first, and I can configure connections with Network Manager without any problem, including my WPA2-Personal home network, but after some time (usually a number of hours, almost always after a suspend-to-ram or hibernate) the wireless connection drops and is unable to reconnect. The only reliable solution is to reboot, which is not a solution. Before opening a bug on Launchpad, I thought I'd check and see if anyone else has managed to resolve this problem. Here's what I've got:

    Problem: wifi in Ubuntu 12.04 64-bit stops working on the Acer Aspire 1810t (Intel WiFi 5100 AGN) after some time, often after a suspend-to-ram.

    ** $ uname -a **

    Linux ubuntubox 3.4.0-030400rc5-generic #201205011817 SMP Tue May 1 22:18:19 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

    (note: the problem is the same when running the stock 3.2.0 kernel)

    ** $ dmesg ** (at the time the connection drops)

    [54671.300096] wlan0: authenticate with 00:24:7b:6d:32:62 (try 1)
    [54671.301874] wlan0: authenticated
    [54671.304312] wlan0: associate with 00:24:7b:6d:32:62 (try 1)
    [54671.308760] wlan0: RX ReassocResp from 00:24:7b:6d:32:62 (capab=0x411 status=0 aid=3)
    [54671.308766] wlan0: associated
    [54681.808039] wlan0: no IPv6 routers present
    [54692.009142] wlan0: deauthenticating from 00:24:7b:6d:32:62 by local choice (reason=3)


    ** $ sudo lshw -C network **

    *-network
    description: Wireless interface
    product: WiFi Link 5100
    vendor: Intel Corporation
    physical id: 0
    bus info: pci@0000:02:00.0
    logical name: wlan0
    version: 00
    serial: <snip>
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
    configuration: broadcast=yes driver=iwlwifi driverversion=3.4.0-030400rc5-generic firmware=8.83.5.1 build 33692 ip=192.168.0.102 latency=0 link=yes multicast=yes wireless=IEEE 802.11abg
    resources: irq:44 memory:d2500000-d2501fff

    ** $ sudo lspci -v **

    02:00.0 Network controller: Intel Corporation WiFi Link 5100
    Subsystem: Intel Corporation WiFi Link 5100 AGN
    Flags: bus master, fast devsel, latency 0, IRQ 44
    Memory at d2500000 (64-bit, non-prefetchable) [size=8K]
    Capabilities: [c8] Power Management version 3
    Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [e0] Express Endpoint, MSI 00
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [140] Device Serial Number <snip>
    Kernel driver in use: iwlwifi
    Kernel modules: iwlwifi

    ** $ cat /etc/network/interfaces **

    auto lo
    iface lo inet loopback

    ** $ sudo rfkill list all **

    2: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
    7: acer-wireless: Wireless LAN
    Soft blocked: no
    Hard blocked: no
    8: acer-bluetooth: Bluetooth
    Soft blocked: yes
    Hard blocked: no


    Troubleshooting
    -----

    * cannot connect to Open APs or WPA2 APs - when the wifi stops working, I cannot connect to any access points, even Open ones.
    * once the network problems start, plugging in a USB WiFi adapter w/ Atheros chipset results in the same problem with both cards. This USB device is known to work with Ubuntu "out of the box", suggesting it is not an iwlwifi driver problem.
    * disabling "N" mode in iwlifi does not work: "options iwlwifi 11n_disable=1" in /etc/modprobe.d/disable11n.conf
    * no option to use ndiswrapper for this wifi card (which is probably a good thing!)
    * unloading iwlwifi before suspend does not work: adding 'SUSPEND_MODULES="$SUSPEND_MODULES iwlwifi"' in /etc/pm/config.d/unload_modules
    * switching to kernel 2.6.39 (with iwlagn driver), 3.3.0, 3.4.0rc5 does not work
    * removing the acer_wmi module (sudo rmmod acer_wmi) does not work, and disables bluetooth
    * "sudo /etc/init.d/networking restart" does not work
    * "sudo stop network-manager && sudo start network-manager" does not work
    * "sudo rmmod iwlwifi && sudo modprobe iwlwifi" does not work
    * deleting the connection in Network Manager and recreating it from scratch does not work

    Next steps to try:
    * use wicd (network-manager problem?)
    * downgrade/upgrade openssl? (seems like a stretch, suggested in this thread: http://crunchbanglinux.org/forums/to...after-upgrade/)

    Any ideas? Thanks in advance!
    Last edited by cyboreal; May 7th, 2012 at 03:42 PM.

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