几周前，我在这台 Mac 上安装了 Ubuntu 19.10。最初几天蓝牙还可以用，但现在找不到蓝牙设备了：
> hcitool dev
Devices:
输出lspci -knn | grep Net -A3; lsusb：
03:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM43602 802.11ac Wireless LAN SoC [14e4:43ba] (rev 01)
Subsystem: Apple Inc. BCM43602 802.11ac Wireless LAN SoC [106b:0133]
Kernel driver in use: brcmfmac
Kernel modules: brcmfmac
Bus 002 Device 002: ID 05ac:8406 Apple, Inc. Card Reader
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 05ac:0273 Apple, Inc. Internal Keyboard/Trackpad (ISO)
Bus 001 Device 004: ID 05ac:8290 Apple, Inc. Bluetooth Host Controller
Bus 001 Device 007: ID 046d:081b Logitech, Inc. Webcam C310
Bus 001 Device 005: ID 1038:1202 SteelSeries ApS Gaming Mouse G502
Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 002: ID 046d:c332 Logitech, Inc. G502 Proteus Spectrum Optical Mouse
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
输出dmesg | grep -i blue：
[ 1.562871] usb 1-3: Product: Bluetooth USB Host Controller
[ 2.104835] input: Broadcom Corp. Bluetooth USB Host Controller as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:05AC:8290.0003/input/input10
[ 2.164582] hid-generic 0003:05AC:8290.0003: input,hidraw2: USB HID v1.11 Keyboard [Broadcom Corp. Bluetooth USB Host Controller] on usb-0000:00:14.0-3/input0
[ 2.164685] input: Broadcom Corp. Bluetooth USB Host Controller as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.1/0003:05AC:8290.0004/input/input11
[ 2.164761] hid-generic 0003:05AC:8290.0004: input,hidraw3: USB HID v1.11 Mouse [Broadcom Corp. Bluetooth USB Host Controller] on usb-0000:00:14.0-3/input1
[ 3.605086] Bluetooth: Core ver 2.22
[ 3.605103] Bluetooth: HCI device and connection manager initialized
[ 3.605107] Bluetooth: HCI socket layer initialized
[ 3.605109] Bluetooth: L2CAP socket layer initialized
[ 3.605112] Bluetooth: SCO socket layer initialized
[ 5.720427] Bluetooth: hci0: command 0x0c03 tx timeout
[ 6.637120] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 6.637122] Bluetooth: BNEP filters: protocol multicast
[ 6.637126] Bluetooth: BNEP socket layer initialized
[ 13.876494] Bluetooth: hci0: BCM: Reset failed (-110)