Bluetooth not working properly

I have this bluetooth adapter.
It shows as

$ lsusb | grep Blue
Bus 001 Device 003: ID 0bda:2550 Realtek Semiconductor Corp. Bluetooth Radio

If I try to connect, I get

$ bluetoothctl
Agent registered
[bluetooth]# devices
No default controller available
$ sudo rmmod btusb
$ sudo modprobe btusb

results in

$ journalctl -e -b
firmware file rtl_bt/rtl8761b_fw.bin not found

bluez and bluez-utils is installed. And I am pretty sure that it worked the first time I put it in.
A different stick works.

My questions:
Any idea, how to resolve the problem?
Is there an easy way to find the driver (that is not google + AUR)?
Is there a way to get something like a list of all installed drivers?

Here is some info to look at first.

Edit: Also that firmware is in the AUR

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Here is some info to look at first.

I already did that. As said, another adapter is working, and I’m pretty sure that this adapter was working, too.
I therefore assume, that that driver must be somewhere in the main packages, and something else is wrong.
Or, I am insanely stupid, and used my old adapter while thinking it was the new one. But I really don’t think so, as my old adapter is very big, and the new one is very small, and I’m pretty sure that I changed it. And I remember beeing happy that the problems of my old adapter were not present. That’s why I’m so confused, that the drivers are apparently missing.

firmware is missing not the driver :wink:

➜  ~ » cd /usr/lib/firmware/rtl_bt 
➜  lib/firmware/rtl_bt » ls
rtl8192ee_fw.bin               rtl8723d_config.bin  rtl8821c_fw.bin       rtl8822cu_fw.bin
rtl8192eu_fw.bin               rtl8723d_fw.bin      rtl8822b_config.bin   rtl8852au_config.bin
rtl8723a_fw.bin                rtl8761a_fw.bin      rtl8822b_fw.bin       rtl8852au_fw.bin
rtl8723b_fw.bin                rtl8812ae_fw.bin     rtl8822cs_config.bin
rtl8723bs_config-OBDA8723.bin  rtl8821a_fw.bin      rtl8822cs_fw.bin
rtl8723bs_fw.bin               rtl8821c_config.bin  rtl8822cu_config.bin


I did provide you a link to the firmware that is available from the AUR.

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