我有一个 GreenTouchPC BT+AC600 Wi-Fi 适配器（信息链接) 应该是 RTL8821CU ( 0bda:c820) 但实际上不是：
# lsusb
Bus 002 Device 005: ID 0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard reader
Bus 002 Device 009: ID 0bda:1a2b Realtek Semiconductor Corp. RTL8188GU 802.11n WLAN Adapter (Driver CDROM Mode) <-- this one
Bus 002 Device 003: ID 5986:0148 Acer, Inc Lenovo EasyCamera
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
我曾尝试使用usb_modeswitch它但神秘地失败了：
# usb_modeswitch -W -v 0bda -p 1a2b -V 0bda -P c820 -K
Take all parameters from the command line
* usb_modeswitch: handle USB devices with multiple modes
* Version 2.6.1 (C) Josua Dietze 2017
* Based on libusb1/libusbx
! PLEASE REPORT NEW CONFIGURATIONS !
DefaultVendor= 0x0bda
DefaultProduct= 0x1a2b
TargetVendor= 0x0bda
TargetProduct= 0xc820
StandardEject=1
Look for target devices ...
found USB ID 0bda:0158
vendor ID matched
found USB ID 0bda:1a2b
vendor ID matched
found USB ID 5986:0148
found USB ID 8087:0020
found USB ID 1d6b:0002
found USB ID 8087:0020
found USB ID 1d6b:0002
No devices in target mode or class found
Look for default devices ...
found USB ID 0bda:0158
vendor ID matched
found USB ID 0bda:1a2b
vendor ID matched
product ID matched
found USB ID 5986:0148
found USB ID 8087:0020
found USB ID 1d6b:0002
found USB ID 8087:0020
found USB ID 1d6b:0002
Found devices in default mode (1)
Access device 009 on bus 002
Get the current device configuration ...
Current configuration number is 1
Use interface number 0
with class 8
Use endpoints 0x0b (out) and 0x8a (in)
USB description data (for identification)
-------------------------
Manufacturer: Realtek
Product: DISK
Serial No.: not provided
-------------------------
Sending standard EJECT sequence
Looking for active drivers ...
Set up interface 0
Use endpoint 0x0b for message sending ...
Trying to send message 1 to endpoint 0x0b ...
Sending the message returned error -7. Try to continue
Read the response to message 1 (CSW) ...
Response reading failed (error -7)
Device is gone, skip any further commands
-> Run lsusb to note any changes. Bye!
这里有谁知道原因吗？有什么解决办法吗？谢谢！