我知道有类似的问题，但所有问题都可以通过添加缺失的固件来解决/lib/firmware/ar3k。这不是我的问题，因为：
sudo dmesg |grep -i bluetooth
给出（请注意没有错误）：
[ 3.316369] NET: Registered PF_BLUETOOTH protocol family
[ 3.316370] Bluetooth: HCI device and connection manager initialized
[ 3.316375] Bluetooth: HCI socket layer initialized
[ 3.316377] Bluetooth: L2CAP socket layer initialized
[ 3.316380] Bluetooth: SCO socket layer initialized
[ 4.275289] Bluetooth: hci0: Device setup in 139936 usecs
[ 5.169408] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 5.169413] Bluetooth: BNEP filters: protocol multicast
[ 5.169417] Bluetooth: BNEP socket layer initialized
[ 12.779673] Bluetooth: RFCOMM TTY layer initialized
[ 12.779688] Bluetooth: RFCOMM socket layer initialized
[ 12.779695] Bluetooth: RFCOMM ver 1.11
此外：
ls /lib/firmware/ar3k
分发：
1020200 AthrBT_0x01020001.dfu AthrBT_0x31010100.dfu ramps_0x01020201_40.dfu
1020201 AthrBT_0x01020200.dfu AthrBT_0x41020000.dfu ramps_0x11020000_40.dfu
1020201coex AthrBT_0x01020201.dfu ramps_0x01020001_26.dfu ramps_0x11020100_40.dfu
30000 AthrBT_0x11020000.dfu ramps_0x01020200_26.dfu ramps_0x31010000_40.dfu
30101 AthrBT_0x11020100.dfu ramps_0x01020200_40.dfu ramps_0x31010100_40.dfu
30101coex AthrBT_0x31010000.dfu ramps_0x01020201_26.dfu ramps_0x41020000_40.dfu
编辑：
lspci -knn | grep Net -A3
给我：
03:00.0 Network controller [0280]: MEDIATEK Corp. MT7921 802.11ax PCI Express Wireless Network Adapter [14c3:7961]
DeviceName: Realtek RTL8111E Ethernet LOM
Subsystem: Lenovo Device [17aa:e0bc]
Kernel driver in use: mt7921e
lsusb返回：
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 048d:c966 Integrated Technology Express, Inc. ITE Device(8176)
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 0489:e0cd Foxconn / Hon Hai Wireless_Device
Bus 001 Device 003: ID 13d3:56ff IMC Networks Integrated Camera
Bus 001 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub