我有一台装有 Ubuntu 15.04 的联想 G510，但我就是看不到蓝牙（以前它能用）
elichai2@Lenovo-G510:~$ uname -a
Linux Lenovo-G510 3.19.0-30-generic #33-Ubuntu SMP Mon Sep 21 20:58:04 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
elichai2@Lenovo-G510:~$ sudo rfkill list all
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
elichai2@Lenovo-G510:~$ sudo lshw -C network
*-network
description: Wireless interface
product: AR9485 Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlan0
version: 01
serial: b8:ee:65:61:57:f6
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=3.19.0-30-generic firmware=N/A ip=10.0.0.10 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:17 memory:b0500000-b057ffff memory:b0580000-b058ffff
*-network
description: Ethernet interface
product: QCA8172 Fast Ethernet
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth0
version: 10
serial: f8:a9:63:25:b4:13
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=alx latency=0 link=no multicast=yes port=twisted pair
resources: irq:30 memory:b0400000-b043ffff ioport:3000(size=128)
elichai2@Lenovo-G510:~$ sudo service bluetooth status
● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: inactive (dead)
elichai2@Lenovo-G510:~$ sudo service bluetooth restart
elichai2@Lenovo-G510:~$ sudo service bluetooth status
● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2015-10-01 11:20:28 IDT; 2s ago
Main PID: 1294 (bluetoothd)
CGroup: /system.slice/bluetooth.service
└─1294 /usr/sbin/bluetoothd -n
Oct 01 11:20:28 Lenovo-G510 bluetoothd[1294]: bluetoothd[1294]: DIS cannot start: GATT is disabled
Oct 01 11:20:28 Lenovo-G510 bluetoothd[1294]: bluetoothd[1294]: Failed to init deviceinfo plugin
Oct 01 11:20:28 Lenovo-G510 bluetoothd[1294]: bluetoothd[1294]: Failed to init proximity plugin
Oct 01 11:20:28 Lenovo-G510 bluetoothd[1294]: bluetoothd[1294]: Failed to init time plugin
Oct 01 11:20:28 Lenovo-G510 bluetoothd[1294]: bluetoothd[1294]: Failed to init alert plugin
Oct 01 11:20:28 Lenovo-G510 bluetoothd[1294]: bluetoothd[1294]: Failed to init thermometer plugin
Oct 01 11:20:28 Lenovo-G510 bluetoothd[1294]: Failed to init gatt_example plugin
Oct 01 11:20:28 Lenovo-G510 bluetoothd[1294]: Bluetooth Management interface initialized
Oct 01 11:20:28 Lenovo-G510 bluetoothd[1294]: bluetoothd[1294]: Failed to init gatt_example plugin
Oct 01 11:20:28 Lenovo-G510 bluetoothd[1294]: bluetoothd[1294]: Bluetooth Management interface initialized
elichai2@Lenovo-G510:~$ sudo lsusb
Bus 004 Device 002: ID 8087:8000 Intel Corp.
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 8087:8008 Intel Corp.
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 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 003: ID 174f:114f Syntek
Bus 001 Device 006: ID 05c6:6765 Qualcomm, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
elichai2@Lenovo-G510:~$ dmesg | grep -i firmware
[ 0.213404] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored
[ 5.659575] psmouse serio1: elantech: assuming hardware version 3 (with firmware version 0x450f03)
elichai2@Lenovo-G510:~$ dmesg | grep -i blue
elichai2@Lenovo-G510:~$ lsmod | grep blue
如果有人知道如何修复它，我很乐意听听（如果您有补丁，我甚至愿意重新编译整个系统）谢谢！
附言：我dmesg | grep -i blue再次运行，现在我发现了以下几行：
[ 4.780100] usb 1-7: Product: Bluetooth USB Host Controller
[ 16.342944] Bluetooth: Core ver 2.20
[ 16.342958] Bluetooth: HCI device and connection manager initialized
[ 16.342962] Bluetooth: HCI socket layer initialized
[ 16.342964] Bluetooth: L2CAP socket layer initialized
[ 16.342968] Bluetooth: SCO socket layer initialized
运行lsmod | grep blue后得到了新的结果：
bluetooth 491520 2 ath3k,btusb
并且蓝牙刚刚恢复到 rfkill :)
elichai2@Lenovo-G510:~$ rfkill list
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_bluetooth: Bluetooth
Soft blocked: yes
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
答案1
使用最新的编辑，您需要做的就是打开一个终端窗口并输入
rfkill unblock all如果它不能修复蓝牙，很可能是因为你没有安装固件
sudo apt-get install linux-firmware
sudo modprobe -r btusb
sudo modprobe -r ath3k
sudo modprobe ath3k
sudo modprobe btusb