Realtek rtl8811cu wifi linux

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Realtek RTL8811CU/RTL8821CU USB Wi-Fi adapter driver for Linux

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brektrou/rtl8821CU

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README.md

Realtek RTL8811CU/RTL8821CU USB wifi adapter driver version 5.4.1 for Linux 4.4.x up to 5.x

Before build this driver make sure make , gcc , linux-header / kernel-devel , bc and git have been installed.

First, clone this repository

mkdir -p ~/build cd ~/build git clone https://github.com/brektrou/rtl8821CU.git 

Check the name of the interface

Check the interface name of your wifi adapter using ifconfig . Usually, it will be wlan0 by default, but it may vary depends on the kernel and your device. On Ubuntu, for example, it may be named as wlx + MAC address. (https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/)

If this is the case, you can either disable the feature following the link above, or replace the name used in the driver by

grep -lr . | xargs sed -i '' -e '/ifcfg-wlan0/!s/wlan0//g' 

Build and install with DKMS

DKMS is a system which will automatically recompile and install a kernel module when a new kernel gets installed or updated. To make use of DKMS, install the dkms package.

To make use of the DKMS feature with this project, just run:

If you later on want to remove it, run:

Plug your USB-wifi-adapter into your PC

If wifi can be detected, congratulations. If not, maybe you need to switch your device usb mode by the following steps in terminal:

Need install usb_modeswitch (Archlinux: sudo pacman -S usb_modeswitch )

sudo usb_modeswitch -KW -v 0bda -p 1a2b systemctl start bluetooth.service - starting Bluetooth service if it's in inactive state 

If steps above worked fine and in order to avoid periodically having to make usb_modeswitch you can make it permanent (Working in Ubuntu 18.04 LTS):

Edit usb_modeswitch rules:

sudo nano /lib/udev/rules.d/40-usb_modeswitch.rules

# Realtek 8211CU Wifi AC USB ATTR=="0bda", ATTR=="1a2b", RUN+="/usr/sbin/usb_modeswitch -K -v 0bda -p 1a2b" 

Make sure to set your ATTR and the -v argument to the left portion of the output of lsusb device ID, and your ATTR and -p argument to the right portion of the lsusb device ID. For example (for the Cudy AC600 usb wifi adapter) the output from lsusb command looks like this:

Bus 001 Device 016: ID 0bda:c811 Realtek Semiconductor Corp. 802.11ac NIC 

then your configuration in /lib/udev/rules.d/40-usb_modeswitch.rules should be

# Realtek 8211CU Wifi AC USB ATTR=="0bda", ATTR=="c811", RUN+="/usr/sbin/usb_modeswitch -K -v 0bda -p c811" 

Build and install without DKMS

cd ~/build/rtl8821CU make sudo make install 

If you later on want to remove it, do the following:

cd ~/build/rtl8821CU sudo make uninstall 

Checking installed driver

If you successfully install the driver, the driver is installed on /lib/modules//kernel/drivers/net/wireless/realtek/rtl8821cu . Check the driver with the ls command:

ls /lib/modules/$(uname -r)/kernel/drivers/net/wireless/realtek/rtl8821cu 

Make sure 8821cu.ko file present on that directory

Check with DKMS (if installing via DKMS):

Use the tool ‘iw’, please don’t use other tools like ‘airmon-ng’

iw dev wlan0 set monitor none 

About

Realtek RTL8811CU/RTL8821CU USB Wi-Fi adapter driver for Linux

Источник

Realtek RTL8811CU Wifi Dongle

How may I get the USB Wifi recognized and operational when I plug it in? When I use the lsusb command it shows:
Realtek Semiconductor Corp . For the manufacturer I know the driver is RTL8811CU On the package I can read:

Dual band USB Adapter; 600 mbps; 2.4 GHz + 5 GHz; USB 2.0 High-Speed; IEEE: 802.11 ac; Supported OS: Windows XP/Vista/7/8/10/Mac/Linux; 

Ubuntu 18.04.4 LTS; Release: 18.04; Codename: bionic; 

use this driver for support of the latest version of the Linux kernel. github.com/morrownr/8821cu-20210916

2 Answers 2

It should work. Just open your network configuration manager and connect to your wi-fi hotspot.

In my case it is in Main menu -> Preferences -> Settings -> Wi-Fi:

If your adapter does not work, you could try:

• sudo apt install dkms -y
• sudo ubuntu-drivers autoinstall
• then

Plug your USB-wifi-adapter into your PC
If wifi can be detected, congratulations. If not, maybe you need to switch your device usb mode by the following steps in terminal: find your usb-wifi-adapter device ID, like 0bda:1a2b , by type:
lsusb
switch the mode by type: (the device ID must be yours.) Need install usb_modeswitch sudo usb_modeswitch -KW -v 0bda -p 1a2b
It should work.

sudo apt install build-essential -y mkdir -p ~/build cd ~/build sudo apt install git git clone https://github.com/brektrou/rtl8821CU.git cd rtl8821CU make sudo make install 

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Realtek RTL8811CU/RTL8821CU USB Wi-Fi adapter driver

License

wikimao/RTL8811CU

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README.md

Realtek RTL8811CU/RTL8821CU USB Wi-Fi adapter driver version 5.4.1 for Linux 4.4.x up to 5.6.x

A few known wireless cards that use this driver include:

To build, you have to retrieve source and run make . If via Git, do following:

sudo apt-get update sudo apt-get install -y build-essential dkms git git clone https://github.com/fastoe/RTL8811CU.git cd RTL8811CU make sudo make install sudo reboot

Plug your USB Wi-Fi adapter into your PC.

Use the tool ‘iw’, please don’t use other tools like ‘airmon-ng’

iw dev wlan0 set monitor none 

Источник