几天前我买了一台新笔记本（hp 250 g7）。网卡（Realtek RTL8821CE 802.11ac (1x1) Wi-Fi 和蓝牙 4.2 Combo，非 vPro）使用专有驱动程序。Wifi 运行正常，但蓝牙完全不工作。
编辑：
lsusb 的输出：
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
Bus 001 Device 002: ID 04d9:1702 Holtek Semiconductor, Inc. Keyboard LKS02
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
dmesg | grep -i blue 的输出：
没有输出
USB 设备的输出：
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh=12
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev=05.03
S: Manufacturer=Linux 5.3.0-19-generic xhci-hcd
S: Product=xHCI Host Controller
S: SerialNumber=0000:00:14.0
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
I: If#=0x0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=04d9 ProdID=1702 Rev=04.06
S: Manufacturer=
S: Product=USB Keyboard
C: #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=100mA
I: If#=0x0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=usbhid
I: If#=0x1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=usbhid
T: Bus=01 Lev=01 Prnt=01 Port=02 Cnt=02 Dev#= 3 Spd=1.5 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=093a ProdID=2510 Rev=01.00
S: Manufacturer=PixArt
S: Product=USB Optical Mouse
C: #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
I: If#=0x0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=usbhid
T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=5000 MxCh= 6
D: Ver= 3.00 Cls=09(hub ) Sub=00 Prot=03 MxPS= 9 #Cfgs= 1
P: Vendor=1d6b ProdID=0003 Rev=05.03
S: Manufacturer=Linux 5.3.0-19-generic xhci-hcd
S: Product=xHCI Host Controller
S: SerialNumber=0000:00:14.0
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
I: If#=0x0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
编辑2：
lspci 的输出：
00:00.0 Host bridge: Intel Corporation Device 3e34 (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 (Whiskey Lake) (rev 02)
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 0c)
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th Gen Core Processor Gaussian Mixture Model
00:12.0 Signal processing controller: Intel Corporation Cannon Point-LP Thermal Controller (rev 30)
00:14.0 USB controller: Intel Corporation Cannon Point-LP USB 3.1 xHCI Controller (rev 30)
00:14.2 RAM memory: Intel Corporation Cannon Point-LP Shared SRAM (rev 30)
00:16.0 Communication controller: Intel Corporation Cannon Point-LP MEI Controller #1 (rev 30)
00:17.0 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller [RAID mode] (rev 30)
00:1d.0 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #9 (rev f0)
00:1d.1 PCI bridge: Intel Corporation Device 9db1 (rev f0)
00:1d.4 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #13 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Cannon Point-LP LPC Controller (rev 30)
00:1f.3 Audio device: Intel Corporation Cannon Point-LP High Definition Audio Controller (rev 30)
00:1f.4 SMBus: Intel Corporation Cannon Point-LP SMBus Controller (rev 30)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Cannon Point-LP SPI Controller (rev 30)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter
03:00.0 Non-Volatile memory controller: Toshiba America Info Systems BG3 NVMe SSD Controller (rev 01)
编辑3：
dmesg | grep hci 的输出：
[ 0.989892] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 0.989895] ehci-pci: EHCI PCI platform driver
[ 0.989909] ehci-platform: EHCI generic platform driver
[ 0.989926] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 0.989928] ohci-pci: OHCI PCI platform driver
[ 0.989940] ohci-platform: OHCI generic platform driver
[ 0.989950] uhci_hcd: USB Universal Host Controller Interface driver
[ 0.990309] xhci_hcd 0000:00:14.0: xHCI Host Controller
[ 0.990316] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 1
[ 0.991411] xhci_hcd 0000:00:14.0: hcc params 0x200077c1 hci version 0x110 quirks 0x0000000000009810
[ 0.991416] xhci_hcd 0000:00:14.0: cache line size of 64 is not supported
[ 0.991645] usb usb1: Manufacturer: Linux 5.3.0-19-generic xhci-hcd
[ 0.993642] xhci_hcd 0000:00:14.0: xHCI Host Controller
[ 0.993646] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 2
[ 0.993650] xhci_hcd 0000:00:14.0: Host supports USB 3.0 SuperSpeed
[ 0.993700] usb usb2: Manufacturer: Linux 5.3.0-19-generic xhci-hcd
[ 1.241302] ahci 0000:00:17.0: version 3.0
[ 1.252583] ahci 0000:00:17.0: AHCI 0001.0301 32 slots 2 ports 6 Gbps 0x3 impl RAID mode
[ 1.252586] ahci 0000:00:17.0: flags: 64bit ncq sntf pm clo only pio slum part deso sadm sds apst
[ 1.252929] scsi host0: ahci
[ 1.253712] scsi host1: ahci
[ 8625.749884] usb 1-2: new low-speed USB device number 2 using xhci_hcd
[ 8626.965541] usb 1-3: new low-speed USB device number 3 using xhci_hcd
答案1
看一眼https://bugs.launchpad.net/ubuntu/+source/linux-oem/+bug/1742613/comments/1获取下载适用于您的 8821cd 的蓝牙驱动程序的链接。