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Thread: WIFI doesn't work (RTL8811/RTL8812)

  1. #1
    Join Date
    Nov 2021
    Beans
    6

    Wink WIFI doesn't work (RTL8811/RTL8812)

    I have one built-in and one USB dongle WIFI adaptors and they don't work.

    Code:
    lsusb
    
    Bus 001 Device 003: ID 0bda:c820 Realtek Semiconductor Corp. 802.11ac NIC 
    Bus 001 Device 005: ID 0bda:c811 Realtek Semiconductor Corp. 802.11ac NIC
    I have installed several drivers but none of them has worked yet:

    Code:
    sudo dkms status 
    
    8812au, 4.2.3, 5.13.0-19-generic, x86_64: installed 
    8821cu, 5.4.1, 5.13.0-19-generic, x86_64: installed 
    88x2bu, 5.8.7.4, 5.13.0-19-generic, x86_64: installed 
    backport-iwlwifi, 9340, 5.13.0-19-generic, x86_64: installed

    Code:
    git clone https://github.com/morrownr/88x2bu.git 
    sudo mv 88x2bu /usr/src/88x2bu-5.8.7.4
    sudo dkms add -m 88x2bu -v 5.8.7.4 
    sudo dkms build -m 88x2bu -v 5.8.7.4 
    sudo dkms install -m 88x2bu -v 5.8.7.4
    I did the same process for the following drivers;

    So far, none of them has worked any of my WIFI devices.

    Does anyone have any idea what is wrong? I have almost lost my hope

    Notes:
    Kernel: 5.13.0-19-generic
    OS: Ubuntu 21.10

    PS: A very similar tread here didn't solve my problem
    https://askubuntu.com/questions/1162974/wireless-usb-adapter-0bdac811-realtek-semiconductor-corp


    Last edited by miklagard2; November 2nd, 2021 at 09:21 PM.

  2. #2
    Join Date
    Jun 2020
    Beans
    328

    Re: WIFI doesn't work (RTL8811/RTL8812)

    i have a funny story that came to mind as i read this...
    sold this laptop awhile back to some woman,everything on it worked 100s.
    few days later she phones me and complains she can't get the wifi to work ,her and her son has tried everything and nothing works and she want to give the laptop back to me ...
    well long story short , i asked her did she flick the physical switch for wifi on the front of lappy ,to ON??

    it worked miraculously after that

    probably not of any help for this thread , but one never knows lol
    xubuntu 20.04.3 LTS (focal fossa)

  3. #3
    Join Date
    Nov 2021
    Beans
    6

    Re: WIFI doesn't work (RTL8811/RTL8812)

    Sadly, there is no any physical switch for this on this computer. Nothing on keyboard as well.

    And sure, USB dongle doesn't have any switch either. Thank you anyway.

  4. #4
    Join Date
    Jun 2020
    Beans
    328

    Re: WIFI doesn't work (RTL8811/RTL8812)

    is it a dual boot with windows system ? i'm just reaching here cause there's not any info
    saw this thread, that's why i'm asking
    https://ubuntuforums.org/showthread.php?t=2468066
    xubuntu 20.04.3 LTS (focal fossa)

  5. #5
    Join Date
    Nov 2021
    Beans
    6

    Re: WIFI doesn't work (RTL8811/RTL8812)

    No, just Ubuntu.

  6. #6
    Join Date
    May 2014
    Location
    /home
    Beans
    9,651
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: WIFI doesn't work (RTL8811/RTL8812)

    What is the result from terminal for
    Code:
    mokutil --sb-state
    Moved to Networking and Wireless

  7. #7
    Join Date
    Nov 2021
    Beans
    6

    Re: WIFI doesn't work (RTL8811/RTL8812)

    This:

    SecureBoot disabled

    Now I upgrade kernel 5.13.0-19 into 5.13.0-20

    And probably it will not solve anything

  8. #8
    Join Date
    May 2014
    Location
    /home
    Beans
    9,651
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: WIFI doesn't work (RTL8811/RTL8812)

    I think the backports-iwlwifi is causing issues so do
    Code:
    sudo dkms uninstall backport-iwlwifi/9340
    sudo dkms remove backport-iwlwifi/9340 --all
    Reboot and see is the USB wifi works

  9. #9
    Join Date
    Nov 2021
    Beans
    6

    Re: WIFI doesn't work (RTL8811/RTL8812)

    That worked, now, two wifi devices are functioning. Thank you so much

    The working driver is:

    8821cu, 5.4.1, 5.13.0-19-generic, x86_64: installed

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