After today’s Kernel update (uname: 5.3.18-59.37-default #1 SMP Mon Nov 22 12:29:04 UTC 2021 (d10168e) x86_64 x86_64 x86_64 GNU/Linux) Bluetooth stopped to work: after connecting to the BT headphones it switches off. I have the BT4.0 USB dongle (ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)) and Arctic P614 BT phones.
You could list which wireless devices are rfkill controlled:
# rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
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If your Bluetooth is blocked then rfkill unblock Bluetooth
Kernels are the latest one from the latest Kernel Repo, the hardware didnt changed.
The same problem, that i have, is that after the connection of bluetooth headphones to the computer its going to switch off power of the bluetooth completely.
Under MX Linux 21.1 everything works as expected out of the box.