Enable bluetooth on Gentoo OS
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bluetoothctl
[bluetooth]# list
Controller 8C:88:2B:44:3C:18 BlueZ 5.66 [default]
[bluetooth]# show 8C:88:2B:44:3C:18
[bluetooth]# power on
[bluetooth]# agent on
[bluetooth]# discoverable on
如果遇到
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Failed to set discoverable on: org.bluez.Error.Busy
或者类似的错误，可以尝试先停掉蓝牙服务，再打开
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rc-service bluetooth stop
rc-service bluetooth start
