关于这个的帖子有很多，我几乎都试过了，但都没有用（这太令人沮丧了！）
我使用的是华硕 TUF B550Plus wifi 游戏主板，已更新至最新 BIOS。但是，它一直提示在设置中未找到蓝牙（见下文）
sudo modprobe btusb我尝试了其他帖子中提到的很多东西，但都没有用。我使用的是 Ubuntu 20.04 和内核5.11.0-37-generic
Systemctl 输出
➜ ~ systemctl status bluetooth
● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2021-10-13 01:36:17 +08; 9min ago
Docs: man:bluetoothd(8)
Main PID: 104679 (bluetoothd)
Status: "Running"
Tasks: 1 (limit: 38354)
Memory: 512.0K
CGroup: /system.slice/bluetooth.service
└─104679 /usr/lib/bluetooth/bluetoothd
Oct 13 01:36:17 wboy systemd[1]: Starting Bluetooth service...
Oct 13 01:36:17 wboy bluetoothd[104679]: Bluetooth daemon 5.53
Oct 13 01:36:17 wboy systemd[1]: Started Bluetooth service.
Oct 13 01:36:17 wboy bluetoothd[104679]: Starting SDP server
Oct 13 01:36:17 wboy bluetoothd[104679]: Bluetooth management interface 1.19 initialized
Bluetoothctl 输出
➜ ~ sudo bluetoothctl
Agent registered
[bluetooth]# show
No default controller available
[bluetooth]#
lshw 输出
➜ ~ sudo lshw -C network
*-network
description: Wireless interface
product: Wi-Fi 6 AX200
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:06:00.0
logical name: wlp6s0
version: 1a
serial: 44:af:28:34:ae:2c
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.11.0-37-generic firmware=59.601f3a66.0 cc-a0-59.ucode ip=192.168.1.93 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:34 memory:fc300000-fc303fff
*-network
description: Ethernet interface
product: RTL8125 2.5GbE Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:07:00.0
logical name: enp7s0
version: 04
serial: f0:2f:74:22:d9:e5
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=5.11.0-37-generic duplex=full firmware=rtl8125b-2_0.0.2 07/13/20 ip=192.168.1.120 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
resources: irq:38 ioport:f000(size=256) memory:fc200000-fc20ffff memory:fc210000-fc213fff
输出lsusb
➜ lsusb
Bus 004 Device 002: ID 05e3:0612 Genesys Logic, Inc. Hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 006: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 003 Device 005: ID 045e:028e Microsoft Corp. Xbox360 Controller
Bus 003 Device 004: ID 0079:181c DragonRise Inc. TGZ Controller
Bus 003 Device 003: ID 2f68:0082 Hoksi Technology DURGOD Taurus K320
Bus 003 Device 002: ID 05e3:0610 Genesys Logic, Inc. Hub
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 1e71:2007 NZXT NZXT USB Device
Bus 001 Device 003: ID 05e3:0610 Genesys Logic, Inc. Hub
Bus 001 Device 002: ID 0b05:1939 ASUSTek Computer, Inc. AURA LED Controller
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
输出sudo dmesg | grep -i blue：
最初它没有返回任何内容，但在运行以下命令后：
sudo systemctl enable bluetooth.service
systemctl start bluetooth
sudo modprobe btusb
然后我得到这个输出
➜ sudo dmesg | grep -i blue
[42389.576251] Bluetooth: Core ver 2.22
[42389.576270] Bluetooth: HCI device and connection manager initialized
[42389.576272] Bluetooth: HCI socket layer initialized
[42389.576274] Bluetooth: L2CAP socket layer initialized
[42389.576276] Bluetooth: SCO socket layer initialized
任何帮助都感激不尽！
答案1
所以我修好了它——虽然我不知道怎么做。我断开并重新连接调制解调器线，然后关闭电脑电源，它就正常工作了