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Thread: Thinkpad randomly loses (and restores) connection, Ubuntu 16.04

  1. #1
    Join Date
    Sep 2017
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    Thinkpad randomly loses (and restores) connection, Ubuntu 16.04

    Hello everybody,

    I've just got a Lenovo X1 carbon and installed Ubuntu 16.04 LTS.

    There seems to be a connectivity bug, that many users report according to a google search, but I was not able to find a solution.

    Although the network manager says that I am connected to the router, and the router is connected to the internet (it works on other devices) I just do not get any connection on my laptop.

    This occurs randomly, and the connectivity is restored randomly as well.

    I tried rebooting the laptop, but i does not work, restarting the network manager only worked once, i changed the power management settings but that did not help either, so I really do not have any clue now.

    My wireless card is Intel Dual-band 7260AC and the driver is iwlwifi.

    Any help is appreciated.

  2. #2
    Join Date
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    Xubuntu Development Release

    Re: Thinkpad randomly loses (and restores) connection, Ubuntu 16.04

    Hiya , welcome to the forums .

    So, the laptop is connected directly to the router AP, and not through a wifi extender, Right!

    in a terminal, please run : $ sudo apt update && sudo apt dist-upgrade

    And share the output of the following commands under a CODE tag like so,

    PHP Code:
    [CODE]
    dmesg grep iwlwifi
    ls -/lib/firmware
    uname -a
    [/CODE
    care to share links of those bug reports related to the wireless behavior you experiencin'. Thanks .
    #
    https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi
    https://wireless.wiki.kernel.org/en/...i/core_release
    https://www.intel.com/content/www/us...000005511.html
    Last edited by BenginM; September 12th, 2017 at 06:13 PM. Reason: add/links
    GNU / Linux Being a newbie is no excuse for being lazy! I'm only exuding positive energy, And Always Learning Something. IRC'in Freenode #ubuntu / sary SSHin' with mosh



  3. #3
    Join Date
    Sep 2017
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    3

    Re: Thinkpad randomly loses (and restores) connection, Ubuntu 16.04

    Update: It is probably a router problem, since my iphone and ipad work, but three different laptop do not.
    In particular on the windows laptop it shows limited connectivity, after rebooting the router it started working on the laptops to.

    links to other people having the same issue:

    https://askubuntu.com/questions/6533...nternet-access
    https://askubuntu.com/questions/7907...ut-no-internet
    https://askubuntu.com/questions/7250...ed-but-it-isnt
    https://askubuntu.com/questions/9077...rowse-internet


    The following is the output of the suggested commands (the connection was working at the time I ran the commands).

    https://paste.ubuntu.com/25522996/


    I am not sure whether this issue can be solved here, but I hope I can be helpful for other users.


    Thanks!

  4. #4
    Join Date
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    Xubuntu Development Release

    Re: Thinkpad randomly loses (and restores) connection, Ubuntu 16.04

    dmesg iwlwifi shows the kernel driver iwlwifi is crashing for some reason , hence the the loose /hang/breaks . this could be a firmware/kernel regression / the firmware is corrupted/BROKEN. the driver not communicating nicely to the driver firmware for some reason! Yes the cause could be coming from the router settings like the channel/band as well as a platform noise related ... #See https://wireless.wiki.kernel.org/en/...platform_noise

    I would suggest you try bootin' with a prior kernel than 4.10.0-33-generic , or a newer one , and see if the issue persists there as well.
    GNU / Linux Being a newbie is no excuse for being lazy! I'm only exuding positive energy, And Always Learning Something. IRC'in Freenode #ubuntu / sary SSHin' with mosh



  5. #5
    Join Date
    Sep 2017
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    3

    Re: Thinkpad randomly loses (and restores) connection, Ubuntu 16.04

    So, I installed (I guess I did, I just copied the .ucode file into /lib/firmware) the suggested driver from the Intel website, and the output of dmesg is now this:

    Code:
    $ dmesg | grep iwlwifi[    8.661781] iwlwifi 0000:03:00.0: loaded firmware version 17.459231.0 op_mode iwlmvm
    [    8.708188] iwlwifi 0000:03:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
    [    8.710507] iwlwifi 0000:03:00.0: L1 Enabled - LTR Enabled
    [    8.711164] iwlwifi 0000:03:00.0: L1 Enabled - LTR Enabled
    [    8.933236] iwlwifi 0000:03:00.0 wlp3s0: renamed from wlan0
    [   10.878926] iwlwifi 0000:03:00.0: L1 Enabled - LTR Enabled
    [   10.879432] iwlwifi 0000:03:00.0: L1 Enabled - LTR Enabled
    [   11.061895] iwlwifi 0000:03:00.0: L1 Enabled - LTR Enabled
    [   11.062398] iwlwifi 0000:03:00.0: L1 Enabled - LTR Enabled
    Does it mean the problem was fixed?

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