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Date:   Wed, 28 Dec 2022 23:25:48 +0100
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From:   Felix Schwarz <felix.schwarz@oss.schwarz.eu>
Subject: rtw_8821cu: "rfe 38 isn't supported" with Linux 6.2rc1 (0bda:c811)
To:     linux-wireless@vger.kernel.org
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Hi,

I noticed that support for Realtek's 8821cu devices was recently merged with 
commit aff5ffd7. I have a "Realtek Semiconductor Corp. 802.11ac NIC" (ID 
0bda:c811) so I decided to try 6.2rc1.

However I only get these messages (and no new wifi network interface) when 
trying to load the module:

rtw_8821cu 1-4:1.0: Firmware version 24.11.0, H2C version 12
rtw_8821cu 1-4:1.0: rfe 38 isn't supported
rtw_8821cu 1-4:1.0: failed to setup chip efuse info
rtw_8821cu 1-4:1.0: failed to setup chip information
usbcore: registered new interface driver rtw_8821cu

I read that the vendor-supplied GPL driver (which I don't use) requires 
"usb_modeswitch" so I ran that just to be sure but still no dice:

$ sudo usb_modeswitch --std-eject --verbose --default-vendor=0bda 
--default-product=c811
[...]
  * usb_modeswitch: handle USB devices with multiple modes
  * Version 2.6.1 (C) Josua Dietze 2017
  * Based on libusb1/libusbx

[...]

Look for default devices ...
   found USB ID 0bda:c811
    vendor ID matched
    product ID matched
[...]
  Found devices in default mode (1)
Access device 005 on bus 001
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


Is there a new branch I could try? Any idea what I am doing wrong?
Felix