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Enable CONFIG_RTW89_8852AU (RTL8852AU/8832AU USB Wi-Fi 6)

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
78/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
linux
Domain
networking, operating-systems

Research direction

Compare bcm2711_defconfig, bcm2711_rt_defconfig, and bcm2712_defconfig with the existing RTW89_8851BU and RTW89_8852BU settings, then check the CONFIG_RTW89_8852AU entry in rpi-6.19.y. Done means the option is enabled as a module in the relevant configurations and the feasibility of a corresponding rpi-6.18.y backport is established; verify with the reported USB adapter.

Written by the indexing model from the issue text.

Description

Describe the bug

The mainline rtw89 driver gained USB support for the RTL8852AU in 6.19 (CONFIG_RTW89_8852AU, e.g. TP-Link Archer TX35U). The Kconfig entry is present in rpi-6.19.y and later, but the option is not set in bcm2711_defconfig, bcm2711_rt_defconfig or bcm2712_defconfig, while RTW89_8851BU and RTW89_8852BU already are (#7096).

Could it be enabled as CONFIG_RTW89_8852AU=m? And would a backport to rpi-6.18.y be feasible, as seems to have been done for 8852BU? Currently the only option on Pi OS is an out-of-tree DKMS driver.

Device: Raspberry Pi 4B, 6.12.109+rpt-rpi-v8 (an upgrade to trixie/6.18 is planned), adapter USB ID 3625:010f (Realtek 802.11ax WLAN Adapter - 3625:010f is already in the mainline rtw8852au.c device table, so enabling the option should be sufficient for this adapter).

Steps to reproduce the behaviour

Any clean install of Pi OS

Device (s)

Raspberry Pi 4 Mod. B

System

Raspberry Pi 4 Model B Rev 1.1
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"

Raspberry Pi reference 2024-03-15
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, f19ee211ddafcae300827f953d143de92a5c6624, stage2

Linux raspberrypi 6.12.109+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.12.109-1+rpt1 (2026-09-11) aarch64 GNU/Linux
Revision : c03111
Model : Raspberry Pi 4 Model B Rev 1.1
Throttled flag : throttled=0x0
Camera : supported=0 detected=0, libcamera interfaces=0

USB Information

/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
|__ Port 1: Dev 2, If 0, Class=Vendor Specific Class, Driver=rtw89_8852au_git, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 3: Dev 4, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
|__ Port 4: Dev 5, If 0, Class=Mass Storage, Driver=uas, 480M

Logs

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Additional context

No response

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