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Thread: Realtek RTL8821CE card stops functioning a few minutes after boot

  1. #1
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    Realtek RTL8821CE card stops functioning a few minutes after boot

    I have a new HP Laptop 15s-fq4553na that came with Windows 11.
    I installed Ubuntu 20.04 as a dual boot.
    WiFi works fine under Windows, but consistently fails shortly after boot into Ubuntu, after which I'm able to click on the WiFi in Settings, but it doesn't find any signals.
    If I boot to Windows and switch airplain mode on and off usind the dedicated button, and then reboot to Ubuntu I get WiFi back, but after 5 minutes it drops again. Doing the same thing whilst booted go Ubuntu doesn't help at all.

    Software & Updates lists "Additional Drivers" as:

    Realtek Semiconductor Co., Ltd,:RTL8821CE 802.11ac PCIe Wireless Network Adapter
    This device is not working.


    Do not use this device.

    wireless-info.txt = https://pastebin.com/BU2DP12j

    I tried

    if=wlo1
    sudo ip link set $if up

    but nothing happened.

    I don't have anything left to try.

  2. #2
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    Re: Realtek RTL8821CE card stops functioning a few minutes after boot

    I now suspect this has something to do with me not doing the MOK management correctly?

    On two occasions during the setup of my new laptop I came across the MOK management blue screen, and on both occasions I tried to duck the issue by selecting "continue to boot", because I didn't know what option to take.

    I don't really understand enough to know how to recover. Any help would be appreciated.

  3. #3
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    Re: Realtek RTL8821CE card stops functioning a few minutes after boot

    I've come across this, but I'm reluctant to do it, as I don't know what I'm doing, and I might make things worse!

    "Resetting MOK keys
    1. Run 'sudo mokutil --reset'.
    2. Reboot.
    3. Validate that the MokManager prompt happens and displays a menu of tasks that could be done in MokManager.

      • This should include the "Reset MOK" task.

    4. Complete the "Reset MOK" task in MokManager.
    5. Pick 'Reboot'.
    6. After the system has booted, verify that the keys only include the Canonical certificate embedded in shim.
      • Use 'sudo mokutil --list-enrolled' to validate the keys that are available.

  4. #4
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    Ubuntu 18.04 Bionic Beaver

    Re: Realtek RTL8821CE card stops functioning a few minutes after boot

    It might be wifi power management, try
    Code:
    sudo sed -i 's/wifi.powersave = 3/wifi.powersave = 2/' /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
    Reboot

  5. #5
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    Re: Realtek RTL8821CE card stops functioning a few minutes after boot

    Quote Originally Posted by jeremy31 View Post
    It might be wifi power management, try
    Code:
    sudo sed -i 's/wifi.powersave = 3/wifi.powersave = 2/' /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
    Reboot
    Bingo! Right first time. Respect to you for sharing your knowledge free of charge, demonstrating that your a human being. I'll try and pass the favour on myself in some way.

  6. #6
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    Re: Realtek RTL8821CE card stops functioning a few minutes after boot

    jeremy31 has given me a fix so that my WiFi is now stable, but I still have:

    Software & Updates lists "Additional Drivers" as:

    Realtek Semiconductor Co., Ltd,:RTL8821CE 802.11ac PCIe Wireless Network Adapter
    This device is not working.
    Do not use this device.

    Even though I don't have any symptoms, as the network card is still marked as not working it bugs me, so I'd like to leave the thread as "unsolved".

  7. #7
    Join Date
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    Ubuntu 18.04 Bionic Beaver

    Re: Realtek RTL8821CE card stops functioning a few minutes after boot

    That is a glitch left from whoever maintains the rtl8821ce-dkms package as this is in the packages list
    Package: rtl8821ce-dkms
    Architecture: all
    Version: 5.5.2.1-0ubuntu4~20.04.4
    Priority: optional
    Section: universe/kernel
    Source: rtl8821ce
    Origin: Ubuntu
    Maintainer: Canonical HWE Team <canonical-hwe@lists.canonical.com>
    Bugs: https://bugs.launchpad.net/ubuntu/+filebug
    Installed-Size: 24638
    Depends: dkms (>= 2.1.0.0), bc
    Filename: pool/universe/r/rtl8821ce/rtl8821ce-dkms_5.5.2.1-0ubuntu4~20.04.4_all.deb
    Size: 2196916
    MD5sum: 8f4f850695006f8af66da9ad369f724f
    SHA1: 99883d4cb73f6325cf28746b4390408c577b07c3
    SHA256: 8d8d669cef4d05eed3f0c0304e852582772f3fb9b87b1f3533 23be2902b1136c
    SHA512: 1421e2bdf2c9a57b93e49d86920ae5ff14f4c002c056962949 d06dfc4894c409fe817310cc0983415ad80a232e5f0f5f7242 8a93581982719d142668708e8032
    Description: DKMS source for the Realtek 8821C PCIe WiFi driver
    Modaliases: rtl8821ce(pci:v000010ECd0000C82Bsv*sd*bc*sc*i*, pci:v000010ECd0000C82Asv*sd*bc*sc*i*, pci:v000010ECd0000C821sv*sd*bc*sc*i*)
    The Additional Drivers program matches a device listed to one you have and then it sits there telling you the device is not working just because this package isn't installed, even though it has support from the Ubuntu kernel

  8. #8
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    Re: Realtek RTL8821CE card stops functioning a few minutes after boot

    Thanks again jeremy31. Two for two.

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