我的 ThinkPad E440 上安装了 Ubuntu 14.04。我的其他 Android 设备都无法检测到我的笔记本电脑，而且我的笔记本电脑也无法检测到它们，并且可见性已设置为开启。
lspci -nnk | grep -iA2
输出是
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
Subsystem: Lenovo Device [17aa:5028]
Kernel driver in use: r8169
04:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
Subsystem: Lenovo Device [17aa:b728]
Kernel driver in use: rtl8723be
还
lsusb
输出是
Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 0bda:b728 Realtek Semiconductor Corp.
Bus 003 Device 004: ID 5986:0397 Acer, Inc
Bus 003 Device 003: ID 138a:0011 Validity Sensors, Inc. VFS5011 Fingerprint Reader
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
还
hciconfig -a
输出是
hci0: Type: BR/EDR Bus: USB
BD Address: 10:08:B1:49:7C:C2 ACL MTU: 820:8 SCO MTU: 255:16
UP RUNNING PSCAN ISCAN
RX bytes:636 acl:0 sco:0 events:41 errors:0
TX bytes:1442 acl:0 sco:0 commands:41 errors:0
Features: 0xff 0xff 0xff 0xfe 0xdb 0xff 0x7b 0x87
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: SLAVE ACCEPT
Name: 'ubuntu-0'
Class: 0x6c0100
Service Classes: Rendering, Capturing, Audio, Telephony
Device Class: Computer, Uncategorized
HCI Version: 4.0 (0x6) Revision: 0xb
LMP Version: 4.0 (0x6) Subversion: 0x8723
Manufacturer: Realtek Semiconductor Corporation (93)