ok this is stupid. It's working. The device was just switched off. rfkill said it's neither soft nor hardblocked, so I thought everything was fine! The hardware-switch was switched on so I thought it should work. Still, there is a fn+f5 combination which was needed to power the device, despite the fact that in bluetooth/main.conf "remember last state" was on false and "power on on boot" was true.
ok this is stupid. It's working. The device was just switched off. rfkill said it's neither soft nor hardblocked, so I thought everything was fine! The hardware-switch was switched on so I thought it should work. Still, there is a fn+f5 combination which was needed to power the device, despite the fact that in bluetooth/main.conf "remember last state" was on false and "power on on boot" was true.