I found cheap MT7821 dongle with monitor mode on aliexpress. My adapter aliexpress link is broken 
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Is there an existing driver for it?
I used this board for quite a while with an USB adapter. Trixie detects it without any issues because it uses the same chipset, although it only has two antennas. Even so, it works really well.
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请问，有蓝牙功能可用么，我最近购买了一个基于MT7921AUN的模块，在AI工具的帮助下绑定了ID和驱动。
当前Wi-Fi可用，但是蓝牙一直提示：
Can’t init device hci1: Connection timed out (110)
hci1: Type: Primary Bus: USB
BD Address: 00:00:00:00:00:00 ACL MTU: 0:0 SCO MTU: 0:0
DOWN
RX bytes:0 acl:0 sco:0 events:0 errors:0
TX bytes:6 acl:0 sco:0 commands:2 errors:0
Features: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
Packet type: DM1 DH1 HV1
Link policy:
Link mode: PERIPHERAL ACCEPT
而且另外不解的是：我更换了21700电池组后，原本CM5自带的 Wi-Fi+蓝牙 信号微弱的问题有了很大改善，基本上达到了正常可用的状态，在隔壁房间都有效。（之前Wi-Fi信号弱，蓝牙有效连接距离短，不在同一房间基本不可用）。
我购买MT7921AUN的模块和21700电池组几乎同时，当前MT7921AUN的蓝牙我还不知道怎么驱动。
老兄，蓝牙可用么
我总是遇到蓝牙驱动超时
Lanthar, everything seems fine on my end, but I don’t use Bluetooth much. I’ll pay closer attention to it. Try checking your power profile, though—there might be a power-saving setting affecting it. That’s one possibility. I haven’t had any Bluetooth issues, but again, I rarely use it. I’ll keep an eye on it.
你是使用的HackerGadgets的AC1200么？
我不只是在uconsole上面测试，我在其他arm linux设备上也遇到蓝牙重制失败的问题，还可能导致整个usb卡死。我不知道是我选错了硬件还是说驱动问题，这方面我不是太懂，不过在AI的指导了，折腾了挺多时间 
Today I use the HG AC1200, but I also used this MT7821 for quite a while without any issues. I’ve never had any problems with Bluetooth. I’ll test it, my friend, and try to pay more attention to this.
谢谢，不过这个应该是MT7921AUN吧
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