就像蓝牙适配器问题。（可能与驱动程序有关）我遇到了蓝牙设备无法正确初始化的相同问题：
$ lsusb | grep Bluetooth
Bus 001 Device 006: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
$ usb-devices | awk '/0a12/' RS=
T: Bus=01 Lev=02 Prnt=02 Port=02 Cnt=01 Dev#= 6 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=0a12 ProdID=0001 Rev=88.91
S: Product=USB1.1-A
C: #Ifs= 2 Cfg#= 1 Atr=e0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
I: If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) …