Ubuntu 20.04 Realtek 8821CE wi-fi does not work properly

[deepakdeshp]

The power management for the wi-fi card is not disabled with following command.

sudo sed -i 's/3/2/' /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf 

, Reboot.
To set it off I had to run

 systemctl restart network-manager.service

Setting the power management did not help as I ran the following script to check network failure.

#!/bin/bashsystemctl restart network-manager.service
while true; do
  ping -c 1 yahoo.com &>/dev/null || date  >>t1
  sleep 2
done

The network failure report

 cat t1Sun 12 Sep 2021 08:34:03 AM IST
Sun 12 Sep 2021 08:40:16 AM IST
Sun 12 Sep 2021 08:40:18 AM IST
Sun 12 Sep 2021 08:40:20 AM IST
Sun 12 Sep 2021 08:40:22 AM IST
Sun 12 Sep 2021 08:42:47 AM IST
Sun 12 Sep 2021 08:45:24 AM IST
Sun 12 Sep 2021 08:45:26 AM IST
Sun 12 Sep 2021 08:45:28 AM IST
Sun 12 Sep 2021 08:46:02 AM IST
Sun 12 Sep 2021 08:50:46 AM IST
Sun 12 Sep 2021 08:50:48 AM IST
Sun 12 Sep 2021 08:50:50 AM IST
Sun 12 Sep 2021 08:55:34 AM IST
Sun 12 Sep 2021 08:55:36 AM IST
Sun 12 Sep 2021 08:55:38 AM IST
Sun 12 Sep 2021 08:55:57 AM IST
Sun 12 Sep 2021 08:56:16 AM IST
Sun 12 Sep 2021 08:57:02 AM IST

  inxi -nzNetwork:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169 
           IF: eno1 state: down mac: <filter> 
           Device-2: Realtek RTL8821CE 802.11ac PCIe Wireless Network Adapter driver: rtw_8821ce 
           IF: wlo1 state: up mac: <filter>

This is a dual boot with Windows 10. With Windows 10 there is no network problem.

Any suggestions please?

[deepakdeshp]

I had installed the driver for 8821CE card from following instructions on Github. I am not sure if the later kernels have the driver for it now. How to unload the drivers installed following the Github instructions and use the kernel driver if it is available?

[Joe_Linux]

https://www.youtube.com/watch?v=GO68UhEEARU

[deepakdeshp]

https://www.youtube.com/watch?v=GO68UhEEARU

Thank you but it is a 20.04 server and there is no GUI

[deepakdeshp]

I am running kernel

 5.13.0-14-generic

. But the wi-fi performance is not proper. Is there are any place I can submit kernel bugs for ubuntu?

[chili555]

Did you try the steps in my post here? https://ubuntuforums.org/showthread....light=dropping

[deepakdeshp]

Did you try the steps in my post here? https://ubuntuforums.org/showthread....light=dropping

Thank you Dr Sheldon,
I made the change in /etc/default/crda and made the last line as REGDOMAIN=IN .I am from India, Rebooted. But there is no joy . The wi-fi network isnt steady.
My machine is
lsb_release -a

No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 20.04.2 LTS
Release:    20.04


Codename:    focalBus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 004: ID 0bda:b00a Realtek Semiconductor Corp. 
Bus 003 Device 003: ID 30c9:0013  
Bus 003 Device 002: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
(base) uma@uma ~ $ lspci -nnk | grep -iA3 network
03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter [10ec:c821]
    DeviceName: WLAN
    Subsystem: Hewlett-Packard Company RTL8821CE 802.11ac PCIe Wireless Network Adapter [103c:831a]
    Kernel driver in use: rtw_8821ce
    Kernel modules: rtw88_8821ce
04:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8] (rev c2)

In the router Band is 2.4 GHZ (B+G+N)
Mode is AP

[deepakdeshp]

 iwconfiglo        no wireless extensions.


eno1      no wireless extensions.


wlo1      IEEE 802.11  ESSID:"DIGISOL"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: C4:70:0B:B8:5F:5B   
          Bit Rate=39 Mb/s   Tx-Power=20 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=64/70  Signal level=-46 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:2517   Missed beacon:0


vmnet1    no wireless extensions.


vmnet8    no wireless extensions.

[deepakdeshp]

This is a triple boot machine and wifi with Windows 10 works without any problems.

[chili555]

This is a triple boot machine and wifi with Windows 10 works without any problems.

That's often the case. The network management mechanism in Windows pretty accurately tracks changes in the router state and stays connected. So far, at least, Ubuntu does not.

Did you undertake the changes to the router settings that I recommended?