我最近安装了 ubuntu 19.10，从那时起我就无法在笔记本电脑上使用蓝牙了。
$ bluetoothctl
Agent registered
[bluetooth]# show
No default controller available
我运行了以下命令。
lspci -nnk | grep -iA3 net; lsusb; dmesg | egrep -i 'blue|firm'
给出以下结果。我不明白。请帮忙。
03:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM43224 802.11a/b/g/n [14e4:4353] (rev 01)
Subsystem: Dell Wireless 1520 Half-size Mini PCIe Card [1028:000e]
Kernel driver in use: wl
Kernel modules: bcma, wl
--
08:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 03)
Subsystem: Dell RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1028:0413]
Kernel driver in use: r8169
Kernel modules: r8169
ff:00.0 Host bridge [0600]: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers [8086:2c62] (rev 05)
Bus 002 Device 003: ID 04ca:00ac Lite-On Technology Corp.
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 0c45:6417 Microdia Integrated Webcam
Bus 001 Device 006: ID 413c:8162 Dell Computer Corp. Integrated Touchpad [Synaptics]
Bus 001 Device 005: ID 413c:8161 Dell Computer Corp. Integrated Keyboard
Bus 001 Device 003: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
[ 0.143018] Spectre V2 : Enabling Restricted Speculation for firmware calls
[ 0.288389] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 1984.492583] Bluetooth: Core ver 2.22
[ 1984.492617] Bluetooth: HCI device and connection manager initialized
[ 1984.492622] Bluetooth: HCI socket layer initialized
[ 1984.492624] Bluetooth: L2CAP socket layer initialized
[ 1984.492628] Bluetooth: SCO socket layer initialized
[ 2078.137288] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 2078.137291] Bluetooth: BNEP filters: protocol multicast
[ 2078.137299] Bluetooth: BNEP socket layer initialized
$ sudo cat /sys/kernel/debug/usb/devices | grep Vendor=0a5c -A8
P: Vendor=0a5c ProdID=4500 Rev= 1.00
S: Manufacturer=Broadcom
S: Product=BCM2046B1
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 94mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=255ms
T: Bus=01 Lev=03 Prnt=03 Port=00 Cnt=01 Dev#= 5 Spd=12 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1