AIC8800 Linux Wi-Fi and Bluetooth Driver

This driver is for the AIC8800D80 chipset, supported by devices such as the Tenda U11 and AX913B.

Important

Choose the branch for your hardware revision before installing. If the driver log reports chip_id=7, chip_mcu_id=1 on an AIC8800D80 or AIC8800DC/DW device, use the legacy-mcu1 branch. It contains the matched legacy firmware and loader profile required to avoid the deterministic firmware upload timeout at 0x170400. Use main when chip_mcu_id=0 or when the MCU revision is unknown.

Hardware revision determines the firmware branch. MCU1 devices should use legacy-mcu1, which also initializes Bluetooth for the kernel's standard btusb driver. After switching branches, rerun sudo ./install.sh and reboot; switching the Git branch alone does not replace the firmware already installed under /lib/firmware.

Added support for devices with Vendor ID 368B (tested).

Tested on Linux kernel 6.16 with Ubuntu 25.04 and 6.1.0.27 with Debian 12.

Note

Maintained branches: This repository now maintains two hardware branches: main for chip_mcu_id=0 or an unknown MCU revision, and legacy-mcu1 for chip_mcu_id=1. Wi-Fi, the kernel's standard btusb Bluetooth path, and the device-scoped ZLP support are integrated into both branches. The former separate bluetooth branch is retired and should no longer be used.

The same driver supports Wi-Fi-only adapters and Wi-Fi/Bluetooth combo adapters. On combo devices, aic_load_fw uploads the AIC firmware and the standard Linux btusb driver handles the Bluetooth HCI interface. The obsolete custom aic_btusb module is not used.

USB device 368b:8d81 also uses the bundled aic_zlp_quirk companion module. It adds the Bluetooth ACL bulk TX zero-length-packet behavior validated in issue #63, while leaving the distribution's original btusb.ko installed and bound to the device. The quirk is filtered to that VID:PID and fails closed when the required kernel probe support is unavailable.

Disclaimer

I did not develop this software, The code is sourced from the Tenda U11 driver. I only made some modifications to the code to adapt it to newer kernel versions. Apart from compilation issues, I am unable to address other problems.

Attention

Before installing the driver, delete all aic8800-related folders under /lib/firmware. Using an incorrect firmware version may cause the system to freeze.

Installation Steps

Method 1: Quick Installation (Recommended)

Method 2: Manual Installation

Copy udev rules:

Copy the aic.rules file to /usr/lib/udev/rules.d/:

sudo cp aic.rules /usr/lib/udev/rules.d/

Copy firmware:

Copy the firmware directories from ./fw to /lib/firmware/:

sudo cp -r ./fw/aic8800* /lib/firmware/

Navigate to the driver directory:

Change to the drivers/aic8800 directory:

cd ./drivers/aic8800

Compile and Install the Driver:

First, compile the driver:

make

Then, install the driver:

sudo make install

For any kernel updates, you'll need to reinstall the driver:

make clean
make
sudo make install

Load the Driver

After installation, load the driver with the following command:

sudo modprobe aic8800_fdrv

Verify the Module is Active

Check if the module is loaded correctly:

lsmod | grep aic

You should see output similar to:

aic8800_fdrv    536576  0
cfg80211        1146880 1   aic8800_fdrv
aic_load_fw     69632   1   aic8800_fdrv
usbcore         348160  10  xhci_hcd,ehci_pci,usbhid,usb_storage,ehci_hcd,xhci_pci,uas,aic_load_fw,uhci_hcd,aic8800_fdrv

After that, plug in your USB wireless network card.

Verify Wi-Fi Device is Active

To check if the Wi-Fi interface is recognized, run:

iwconfig

If the device is still not active, check the kernel logs for any errors related to the driver:

sudo dmesg

Bluetooth on Combo Adapters

Bluetooth support does not require a separate AIC transport module. After aic_load_fw initializes a combo adapter, the kernel automatically binds its Bluetooth interface to btusb. A Wi-Fi-only adapter does not expose that interface, so the Bluetooth path remains inactive.

Verify the expected modules and controller with:

lsmod | grep -E 'aic_load_fw|aic8800_fdrv|aic_zlp_quirk|btusb'
lsusb -t
bluetoothctl list

To scan after a controller appears:

bluetoothctl
power on
scan on

If Bluetooth is missing or reports HCI timeouts, run the read-only diagnostic script and attach its output together with the current boot log:

chmod +x diagnose_bt.sh
sudo ./diagnose_bt.sh
sudo journalctl -k -b --no-pager

The installer removes active references to the retired aic_btusb integration. It does not force-load btusb or globally change the Bluetooth rfkill state; normal kernel device matching and the user's system policy remain in control.

For 368b:8d81, verify the ZLP hook and its injection counter while Bluetooth traffic is active:

cat /sys/module/aic_zlp_quirk/parameters/hook
cat /sys/module/aic_zlp_quirk/parameters/injections

The Wi-Fi-reset recovery behavior tracked in issue #53 remains a known limitation: after an airplane-mode or hotspot reset, Bluetooth may require a physical unplug/replug of the adapter.