[24.10.rc7] cannot recognize an USB dongle with rtl8821au

s0nny · February 27, 2025, 7:36am

Hello,

Using 24.10.rc7 on OpenWrt One, Buffalo WI-U2-433DHP (USB2) - rtl8821au is not recognized. The dongle works fine with a Windows11 machine. On Luci, it is shown as "Generic Unkown". kmod-rtw88, kmod-rtw88-88xa and kmod-rtw88-usb have been installed. A powered USB hub is used. Any suggestions?

psherman · February 27, 2025, 7:42am

Your device is rtl, not rtw. Try installing the rtl firmware.

rtl8821a-firmware - 20241110-r1 - RealTek RTL8821AU firmware

s0nny · February 27, 2025, 7:53am

Thanks. Installed it, but still I see "Generic Unknown".

s0nny · February 27, 2025, 8:08am

this is from lsusb
"Bus 001 Device 003: ID 0411:029b Realtek 802.11ac WLAN Adapter"
so product id is 0x029b

frollic · February 27, 2025, 12:52pm

probably not backported from 6.13+, and not supported by rtw88.
you should upgrade to 24.10 stable, no matter what, but it won't help you here.

github.com/morrownr/USB-WiFi

home/USB_WiFi_Chipsets.md

main

## USB WiFi chipset information for Linux

Updated as of 2024-12-17.

This document is a summary that includes information about many modern USB WiFi chipsets. If you see errors in this information, please post in Issues.

Not all USB WiFi adapters are created equally.  While the chipset and driver
dictate which WiFi features are supported (e.g. which frequency bands), the
vendor of the adapter is free to decide on the performance of the antenna(s),
the quality of the amp and whether the device requires mode switching and so on.

| Chipset           | Interface | Standard | Maximum<br>Channel<br>Width   | Linux<br>In-Kernel<br>Driver | AP Mode        | Monitor Mode   | Recommended<br>For<br>Linux |
|:------------------:|-----------|----------|:-----:|:----------------------------:|:----------------:|:----------------:|:-----------------:|
Mediatek MT7927   | USB3      | WiFi 7  |  320   | pending       |  |  |  |
Mediatek MT7925   | USB3      | WiFi 7  |  160   |:heavy_check_mark: 6.7+       |:heavy_check_mark:|:heavy_check_mark:| Yes [4] |
Mediatek MT7922u  | USB3      | WiFi 6E |  160   | pending       |  |  |  |
Realtek RTL8852cu | ?         | WiFi 6E  |  160  |:x: [6]                       |                  |                  | No  |
Realtek RTL8832cu | USB3      | WiFi 6E  |  160  |:x:                           |                  |                  | No  |
Mediatek MT7921au | USB3      | WiFi 6E  |   80  |:heavy_check_mark: 5.18+      |:heavy_check_mark:|:heavy_check_mark:| Yes |
Realtek RTL8852bu | ?         | WiFi 6   |   80  |:x: [6]                       |                  |                  | No  |

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psherman · March 8, 2025, 2:11am

A post was split to a new topic: OpenWrt One - USB_VBUS" L3 pin at MT7981b is becoming "H" state during booting?

system · March 18, 2025, 2:11am

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