Realtek 8811cu linux driver

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

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

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:

find your usb-wifi-adapter device ID, like «0bda:1a2b», by type:

switch the mode by type: (the device ID must be yours.)

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

Make it permanent

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:

Append before the end line LABEL=»modeswitch_rules_end» the following:

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:

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

Build and install without DKMS

Use following commands:

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

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:

Make sure 8821cu.ko file present on that directory

Check with DKMS (if installing via DKMS):

sudo dkms status

ARM architecture tweak for this driver (this solves compilation problem of this driver):

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

About

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

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Realtek 8811cu linux driver

Linux Driver for USB WiFi Adapters that are based on the RTL8811CU, RTL8821CU and RTL8731AU Chipsets

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README.md

Linux Driver for USB WiFi Adapters that are based on the RTL8811CU, RTL8821CU and RTL8731AU Chipsets

v5.8.1.7 (Realtek) (2020-09-29)
Plus updates from the Linux community

IEEE 802.11 b/g/n/ac WiFi compliant
802.1x, WEP, WPA TKIP and WPA2 AES/Mixed mode for PSK and TLS (Radius)
IEEE 802.11b/g/n/ac Client mode
- Support wireless security for WEP, WPA TKIP and WPA2 AES PSK
- Support site survey scan and manual connect
- Support power saving mode
Supported interface modes:
- IBSS
- Managed
- AP
- Monitor
- P2P-client
- P2P-GO
Log level control
LED control
Power saving control
VHT control (allows 80 MHz channel width in AP mode)

A FAQ is available at the end of this document.

Kernels: 2.6.24 — 5.8 (Realtek)
Kernels: 5.9 — 5.15

Tested Linux Distributions

Arch Linux (kernel 5.4)

Arch Linux (kernel 5.9)

Fedora (kernel 5.11)

Linux Mint 20.2 (Linux Mint based on Ubuntu) (kernel 5.11)

Linux Mint 20 (Linux Mint based on Ubuntu) (kernel 5.4)

LMDE 4 (Linux Mint based on Debian) (kernel 4.19)

Manjaro 20.1 (kernel 5.9)

Raspberry Pi OS (2021-01-11) (ARM 32 bit) (kernel 5.10)

Raspberry Pi Desktop (x86 32 bit) (kernel 4.19)

Ubuntu 21.04 (kernel 5.11)

Ubuntu 20.04 (kernel 5.4)

Download Locations for Tested Linux Distributions

Cudy WU700
BrosTrend AC5L
EDUP EP-AC1651
EDUP EP-AC1635
D-Link — DWA-171C
TOTOLINK A650UA v3
Mercusys MU6H (multi-state)
Numerous additional products that are based on the supported chipsets

Warning: Beware of «multi-state» USB WiFi adapters. Some USB WiFi adapters have proprietary Windows drivers onboard. When plugged in, they act like a flash drive or CDROM and on Windows will attempt to start installing the Windows driver. That won’t work on Linux or MAC or any other non-Windows OS so the adapter sits there in flash drive or CDROM mode. The problem is that the state of the adapter has to be changed for the adapter to show up as the device that you expect, in this case, a WiFi adapter. Most modern Linux distributions ship with a utility called «usb-modeswitch» that will handle this issue for you if it has the correct information for your adapter. It is a good utility but if you buy adapters that are «multi-state,» that is one more potential headache you may have to deal with when something goes wrong. Often you can indentify adapters that are «multi-state» as they are advertised as «free driver» or «free installation driver.» If you are looking to buy a USB WiFi adapter for use on Linux, MAC OS, *NIX or anything besides Windows, it is a good idea to seek out single-state adapters.

Note: Some adapter makers change the chipsets in their products while keeping the same model number so please check to confirm that the product you plan to buy has the chipset you are expecting.

The installation instructions are for the novice user. Experienced users are welcome to alter the installation to meet their needs.

Temporary internet access is required for installation. There are numerous ways to enable temporary internet access depending on your hardware and situation. One method is to use tethering from a phone.. Another method to enable temporary internet access is to keep a wifi adapter that uses an in-kernel driver in your toolkit.

You will need to use the terminal interface. The quick way to open a terminal: Ctrl+Alt+T (hold down on the Ctrl and Alt keys then press the T key)

DKMS is used for the installation. DKMS is a system utility which will automatically recompile and install this driver when a new kernel is installed. DKMS is provided by and maintained by Dell.

It is recommended that you do not delete the driver directory after installation as the directory contains information and scripts that you may need in the future.

There is no need to disable Secure Mode to install this driver. If Secure Mode is properly setup on your system, this installation will support it.

Step 1: Open a terminal (Ctrl+Alt+T)

Step 2: Update the system (select the option for the OS you are using)

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Thread: Driver for RTL8811 Wireless Adapter for Ubuntu 18.04

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Driver for RTL8811 Wireless Adapter for Ubuntu 18.04

Does anyone have an experience of installing the drivers for RTL8811 Wireless Adapter for Ubuntu 18.04 ?

Re: Driver for RTL8811 Wireless Adapter for Ubuntu 18.04

Is it a USB adapter? Please run and post:

Re: Driver for RTL8811 Wireless Adapter for Ubuntu 18.04

Hello,
Output is :
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 005: ID 0c45:64ad Microdia
Bus 001 Device 004: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 006: ID 0cf3:0036 Atheros Communications, Inc.
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 0bda:c811 Realtek Semiconductor Corp.
Bus 003 Device 002: ID 046d:c52f Logitech, Inc. Unifying Receiver
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Re: Driver for RTL8811 Wireless Adapter for Ubuntu 18.04

Please get a working internet connection by ethernet, tethering or whatever means possible. Open a terminal and do:

Post back any errors, warnings, etc.

Re: Driver for RTL8811 Wireless Adapter for Ubuntu 18.04

Man ! I cannot describe how grateful I am . I have been looking for a solution for days now. Your solution worked perfectly ! You are the man . Thanks a lot !
I just added one step. Everything else was smooth.

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Читайте также: Bgp linux или cisco

Thread: Driver for rtl8811cu?

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Driver for rtl8811cu?

is there a driver available for the realtek rtl8811cu? i’ve been looking everywhere and culd not find one for the life of me, the one for 8811au doesnt seem to want to work

Re: Driver for rtl8811cu?

How about if we start at the beginning. Please run and post:

Re: Driver for rtl8811cu?

0bda:c811 is the usb dongle

Re: Driver for rtl8811cu?

Which one, exactly? In what way did it not work? Did it compile or not? Did it load and drive your device or not? Did it connect? Drop? Or. what??

Re: Driver for rtl8811cu?

https://github.com/sloretz/rtl8811au
didnt compile, but i solved those issues, it did load but the device wasnt recognized

Re: Driver for rtl8811cu?

Regrettably, I must admit that, after two days of searching, compiling, tweaking c code, etc., that I have no suggestions. In the git repository that you used, your c811 device isn’t even mentioned. It is not surprising that it doesn’t drive your device.

I wish I had better news.

Where is 0xC811? Would you like to try to add it and recompile?

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[Solved] Realtek 8811CU Wireless LAN 802.11ac USB NIC

#1 Post by srmg » Tue Jan 28, 2020 3:25 pm

[Solved] Goodafternoon from Mariagrazia,
I’m from Italy and I’m sorry for my poor english. I had a very old laptop. HP Compaq6720 with cpu Intel Celeron (R) 550 @200GHz freq. -64bit, Bios date 1/10/2008. I installed mx linux 4.19.0-6 amd 64 (x86-64) because my laptop has a very small memory and I can’t install windows 10 so I decided to try with a linux os and I really like mx linux but I have a problem: I bought a wifi adapter to have a better signal. Till I had Windows vista I can use it but now The usb adapter doesn’t have a driver for linux but onli for windows and mac. The adapter is the one I wrote in the subject:Realtek 8811CU Wireless LAN 802.11ac USB NIC. Someone can suggest me how can I write a program to use my adapter or can you suggest me another one not so expensive that I can buy on Amazon. I saw varous model that promise to be right for linux but I’ m not so sure that they are right for the last version of mx linux. Can you help me? Thank you in advance for what you can do. Mariagrazia

Note: Thank you to all of us and in a special way to gsm

mod note: edited text formatting, please use only standard text, thank you

Re: Realtek 8811CU Wireless LAN 802.11ac USB NIC

#2 Post by Head_on_a_Stick » Tue Jan 28, 2020 3:33 pm

Re: Realtek 8811CU Wireless LAN 802.11ac USB NIC

#3 Post by srmg » Fri Jan 31, 2020 5:29 pm

$ sudo usb_modeswitch -KW -v 0bda:1a2b
Take all parameters from the command line

* usb_modeswitch: handle USB devices with multiple modes
* Version 2.5.2 (C) Josua Dietze 2017
* Based on libusb1/libusbx

! PLEASE REPORT NEW CONFIGURATIONS !

No default vendor/product ID given. Abort

Re: Realtek 8811CU Wireless LAN 802.11ac USB NIC

#4 Post by gsm » Sat Feb 08, 2020 11:48 am

/build/rtl8821CU/dkms-install.sh. The description e.g. does not mention the correct path ./dkms-install.sh should perhaps be ./rtl8821CU/dkms-install.sh
It is to bad that you need to carry out all these steps before the adapter can be used.
In my opinion this driver should have been included in the Linux kernel. In W10 it just works out of the box.

Re: Realtek 8811CU Wireless LAN 802.11ac USB NIC

#5 Post by gsm » Mon Feb 17, 2020 5:47 pm

Re: Realtek 8811CU Wireless LAN 802.11ac USB NIC

#6 Post by gsm » Sat Feb 22, 2020 6:18 pm

I did the installation of the RTL8811CU WiFi adapter allover again.

I used the command lsusb first without the USB adapter plugged in.
Next i plugged the adapter into the USB port.
Then a second time lsusb gave me an extra line, showing that my adapter ID is: 0bda:c811
So in my case the next command is:

Take all parameters from the command line

* usb_modeswitch: handle USB devices with multiple modes
* Version 2.5.2 (C) Josua Dietze 2017
* Based on libusb1/libusbx

! PLEASE REPORT NEW CONFIGURATIONS !

DefaultVendor= 0x0bda
DefaultProduct= 0xc811

Look for default devices .
found USB ID 0bda:0111
vendor ID matched
found USB ID 0bda:c811
vendor ID matched
product ID matched
found USB ID 1d6b:0002
found USB ID 0a12:0001
found USB ID 1d6b:0001
found USB ID 1d6b:0001
found USB ID 1d6b:0001
found USB ID 1d6b:0001
found USB ID 1d6b:0002
found USB ID 046d:c52f
found USB ID 1d6b:0001
found USB ID 1d6b:0001
Found devices in default mode (1)
Access device 004 on bus 003
Get the current device configuration .
Current configuration number is 1
Use interface number 0
with class 255
Error: can’t use storage command in MessageContent with interface 0; interface class is 255, expected 8. Abort

So then i tried the build and install without dkms.
Use following commands (the make takes some time ;-):

Re: Realtek 8811CU Wireless LAN 802.11ac USB NIC

#7 Post by gsm » Tue Feb 25, 2020 8:57 am

/build/rtl8821CU folder with the required driver files:

About to run dkms install steps.

Creating symlink /var/lib/dkms/rtl8821CU/5.4.1/source ->
/usr/src/rtl8821CU-5.4.1

DKMS: add completed.

Kernel preparation unnecessary for this kernel. Skipping.

Building module:
cleaning build area.
‘make’ KVER=4.19.0-6-686-pae.
cleaning build area.

DKMS: build completed.

8821cu.ko:
Running module version sanity check.
— Original module
— No original module exists within this kernel
— Installation
— Installing to /lib/modules/4.19.0-6-686-pae/kernel/drivers/net/wireless/realtek/rtl8821cu/

depmod.
System has not been booted with systemd as init system (PID 1). Can’t operate.
Failed to connect to bus: Host is inactief

DKMS: install completed.
Finished running dkms install steps.

Re: Realtek 8811CU Wireless LAN 802.11ac USB NIC

#8 Post by srmg » Fri Mar 06, 2020 5:44 am

/build/rtl8821CU folder with the required driver files:
CODE: SELECT ALL

Dear Gsm thank you again. I make every action as you said and my terminal give me the same result you had but when I put my usb adapter it is still unusable . What can I do. Now I’ll try also your other suggestion but I’m a bit
However thanks for your help. Mariagrazia

Resolved. Realtek 8811CU Wireless LAN 802.11ac USB NIC

#9 Post by srmg » Fri Mar 06, 2020 6:11 am

Gsm thank you very much finally my usb adapter is alive.

I tried to execute other suggestion con lsusb and this is the result of the terminal:

$ sudo usb_modeswitch -KW -v 0bda -p 1a2b
[sudo] password di srmg:
Take all parameters from the command line

* usb_modeswitch: handle USB devices with multiple modes
* Version 2.5.2 (C) Josua Dietze 2017
* Based on libusb1/libusbx

! PLEASE REPORT NEW CONFIGURATIONS !

DefaultVendor= 0x0bda
DefaultProduct= 0x1a2b

Look for default devices .
found USB ID 0bda:1a2b
vendor ID matched
product ID matched
found USB ID 1d6b:0002
found USB ID 1d6b:0001
found USB ID 1d6b:0001
found USB ID 046d:c05a
found USB ID 1a40:0101
found USB ID 1d6b:0001
found USB ID 1d6b:0002
found USB ID 1d6b:0001
Found devices in default mode (1)
Access device 005 on bus 004
Get the current device configuration .
Current configuration number is 1
Use interface number 0
with class 8
Use endpoints 0x0b (out) and 0x8a (in)

USB description data (for identification)
————————-
Manufacturer: Realtek
Product: DISK
Serial No.: not provided
————————-
Sending standard EJECT sequence
Looking for active drivers .
OK, driver detached
Set up interface 0
Use endpoint 0x0b for message sending .
Trying to send message 1 to endpoint 0x0b .
OK, message successfully sent
Read the response to message 1 (CSW) .
Response successfully read (13 bytes), status 1
Trying to send message 2 to endpoint 0x0b .
OK, message successfully sent
Read the response to message 2 (CSW) .
Response successfully read (13 bytes), status 0
Trying to send message 3 to endpoint 0x0b .
Device seems to have vanished right after sending. Good.
Device is gone, skip any further commands
-> Run lsusb to note any changes. Bye!

$ lsusb
Bus 004 Device 006: ID 0bda:c811 Realtek Semiconductor Corp.
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 003: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse
Bus 003 Device 002: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
srmg@mxlinux19.1x64mg:

And now the adapter go on in doing its work. Thank you very much from srmg Gsm you are

mod note: removed text formatting. Use the code button located next to the quotes for terminal output text.

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