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0f7b58d
(Get the code!)
On Thinkpad T420s, switching off Bluetooth make the device disapper by rfkill soft blocked state and hence the icon. Reenabeling is possible via rfkill only, all UI applications state "no device" until then. If reenabled by 'rfkill unblock <device>', icon reappears immediately and all is fine until we switch of bluetooth by UI again.