Debug 在置底。
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說明：筆者使用於筆電之內建藍芽與藍芽機械式鍵盤進行配對 。
*** 規格 ***
系統： Debian Jessie 8.0
核心：3.18.21
筆電：Acer VN7-591G
鍵盤：ZIPPY BW7050
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查看無線驅動：
lspci -k|grep -iA2 Network
0d:00.0 Network controller: Qualcomm Atheros AR9462 Wireless Network Adapter (rev 01)
Subsystem: Foxconn International, Inc. Device e052
Kernel driver in use:
ath9k
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檢查驅動：
lsmod |grep ath9k
lsmod |grep bluetooth
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安裝 bluetooth 套件：
apt-get update
apt-get install bluetooth bluez
apt-get upgrade -y
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啟動服務：
systemctl enable bluetooth.service
systemctl start bluetooth.service
systemctl status bluetooth.service
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設定檔：vi /etc/default/bluetooth
# Defaults for bluez-utils
# This file supersedes /etc/default/bluez-pan. If
# that exists on your system, you should use this
# file instead and remove the old one. Until you
# do so, the contents of this file will be ignored.
# start bluetooth on boot?
# compatibility note: If this variable is not found bluetooth will
# start
BLUETOOTH_ENABLED=1
# This setting will switch HID devices (e.g mouse/keyboad) to HCI mode, that is
# you will have bluetooth functionality from your dongle instead of only HID.
# Note that not every bluetooth dongle is capable of switching back to HID
# mode, see http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=355497
HID2HCI_ENABLED=1
HID2HCI_UNDO=1
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常用指令：
hciconfig: 顯示本機藍芽裝置
hciconfig -a: 顯示本機藍芽裝置詳細資訊
hciconfig hci0 up/down: 啟用 / 關閉第一個藍芽裝置 ( hci0 )
hcitool dev: 顯示本機所有藍芽裝置address
hcitool scan: 搜尋周邊欄芽裝置
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無線裝置軟/硬體開關 (blocked:no 為裝置開啟)：
sudo rfkill list
0: acer-wireless: Wireless LAN
Soft blocked: yes
Hard blocked: no
1: acer-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: yes
Hard blocked: yes
3: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
sudo rfkill block all -----------> 關閉全部無線裝置
rfkill unblock bluetooth--------> 只開啟 bluetooth
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使用 bluetoothctl 指令配對連線：
bluetoothctl -----------> 進入 bleutoothctl 指令模式 exit 或 quit 可離開
以下為 [bluetooth]# 下的指令：
help
version
power on -------------> 開啟藍芽
list --------------------> 查看本機 Bluetooth
discoverable off -------> 筆電藍芽不開放給別人看到
pairable off ------------> 筆電藍芽不開放給別人配對
scan on ----------------> 開啟掃描，此時會抓到我的鍵盤 BT address
[NEW] Device AB:CD:EF:00:11:22 我的鍵盤 BT Address
開始連線 ( [bluetooth]# 下)：
info AB:CD:EF:00:11:22 -----> 查看鍵盤藍芽裝置
pair AB:CD:EF:00:11:22 -----> 配對
trust AB:CD:EF:00:11:22 -----> 加到信任
unblock AB:CD:EF:00:11:22 -> 不阻擋
connect AB:CD:EF:00:11:22 -> 連線
此時沒意外話，可以連上鍵盤了。
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Debug
善用幾個指令 debug 看系統訊息，方便至 google 爬文。
dmesg | grep -i bluetooth
sudo grep bluetooth /var/log/syslog
systemctl status bluetooth
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Debug1
核心驅動問題
cd /usr/src/linux
make menuconfig
進入 -*- Networking support ---> <M> Bluetooth subsystem support --->
--- Bluetooth subsystem support
│ │ [ ] Bluetooth 6LoWPAN support
│ │ RFCOMM protocol support
│ │ [*] RFCOMM TTY support
│ │ BNEP protocol support
│ │ [*] Multicast filter support
│ │ [*] Protocol filter support
│ │ CMTP protocol support
│ │ HIDP protocol support
│ │ Bluetooth device drivers --->
進入 -*- Networking support ---> <M> Bluetooth subsystem support ---> Bluetooth device drivers -->
HCI USB driver
│ │ HCI SDIO driver
│ │ HCI UART driver
│ │ [*] UART (H4) protocol support
│ │ [*] BCSP protocol support
│ │ [*] Atheros AR300x serial support
│ │ [*] HCILL protocol support
│ │ [*] Three-wire UART (H5) protocol support
│ │ HCI BCM203x USB driver
│ │ HCI BPA10x USB driver
│ │ HCI BlueFRITZ! USB driver
│ │ HCI DTL1 (PC Card) driver
│ │ HCI BT3C (PC Card) driver
│ │ HCI BlueCard (PC Card) driver
│ │ HCI UART (PC Card) device driver
│ │ HCI VHCI (Virtual HCI device) driver
│ │ Marvell Bluetooth driver support
│ │ Marvell BT-over-SDIO driver
│ │ Atheros firmware download driver
save ---> exit
time make-kpkg --initrd --revision=$version kernel_image -j $CORE
dpkg -i linux-image-$version_amd64.deb
reboot
.
.
.
其他驅動問題，參考
http://ubuntuforums.org/showthread.php?t=2251009
至
http://drvbp1.linux-foundation.org/~mcgrof/rel-html/backports/ 下載對應核心之 backport 檔，接著做：
cd Desktop/backports-3.18-rc1-1
make defconfig-ath9k
make
sudo make install
sudo reboot
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Debug 2
hciconfig ------> 無輸出
hcitool dev ----> 無裝置
hcitool scan ---> 無輸出
查看無線 WiFi/Bluetooth 卡是不是 Atheros 的？
lspci -k |grep -i network
參考
http://unix.stackexchange.com/questions/146097/bluetooth-device-not-working-debian-wheezy
可以試試安裝
apt-get install firmware-atheros
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Debug 3
因本人在編譯其他軔體時，不小心誤將 Bluetooth 的其中一個 firmware 刪除或覆蓋，因此在開機的時候，就顯示如下圖：
使用以下指令也可以看到此錯誤訊息：
dmesg | grep -i bluetooth
使用下列指令去尋找 ar3k 這個資料夾：
find / -name ar3k
確實裏面找不到 ramps_0x11020100_40.dfu 這個檔案
可以到以下網址去下載：
http://git.kernel.org/cgit/linux/kernel/git/firmware/linux-firmware.git/tree/ar3k
將所缺失的檔案載入，就ok了。
然後在 reboot 。
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Reference:
https://wiki.debian.org/BluetoothUser
