BT 功能消失

Question

问题：
蓝牙硬件设备未找到/打开/连接其他外部和配对/添加的设备。

症状：
命令$ sudo systemctl status bluetooth.service显示：

bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2022-02-12 12:38:25 -03; 11min ago
       Docs: man:bluetoothd(8)
   Main PID: 1325 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 8123)
     Memory: 1.5M
     CGroup: /system.slice/bluetooth.service
             └─1325 /usr/lib/bluetooth/bluetoothd

feb 12 12:38:25 systemd[1]: Starting Bluetooth service...
feb 12 12:38:25 bluetoothd[1325]: Bluetooth daemon 5.53
feb 12 12:38:25 systemd[1]: Started Bluetooth service.
feb 12 12:38:25 bluetoothd[1325]: Starting SDP server
feb 12 12:38:25 bluetoothd[1325]: Bluetooth management interface 1.20 initialized

命令$ rfkill list显示：

0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: hci0: Bluetooth
        Soft blocked: yes
        Hard blocked: no

命令$ dmesg | grep bluetooth显示：

[13.253973] bluetooth hci0: Direct firmware load for rtl_bt/rtl8723b_config.bin failed with error -2

消息人士询问：
来源1
来源2
来源 3
来源4
这些都无法解决问题。有什么想法吗？

解决方法：
从挂起/睡眠（黑屏）模式硬重启后，该问题得到解决。