Realtek RTL8851BU USB Wi-Fi Driver (Linux)

This is an out-of-tree Linux kernel driver for the Realtek RTL8851BU USB Wi-Fi adapter.
The code was originally provided by [UGREEN Support] and has been patched and maintained here to build cleanly on modern Linux kernels (6.x and newer).

Tested against CM845 UGreen WiFi6/BT5.4 USB adapter AX900

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✨ Features

• Supports RTL8851BU chipset (802.11ax / Wi-Fi 6 USB adapters e.g. Ugreen AX900 Wi-Fi6 Bluetooth5.4 USB adapter model CM845)
• Builds against Linux kernel 6.x (tested up to 6.14 / 6.15)
• Includes fixes for:
  • Missing headers (drv_types.h and friends)
  • cfg80211 API changes (get_tx_power, set_monitor_channel, cac_event, etc.)
  • Warnings promoted to errors on new GCC
  • Noisy debug output (configurable via module parameters)

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📦 Installation

1. Clone this repository

git clone https://github.com/leopck/rtl8851bu.git
cd rtl8851bu

2. Build and install

make
sudo make install

3. Load the module

sudo modprobe cfg80211
sudo modprobe 8851bu