I’ve been having the same issue. Bluetooth fails to connect to my headphones and when I try to forget and re-pair the device it just shows that there is no bluetooth adapter (I have a AX200). In my case even the KDE GUI is messed up in the taskbar/panel
Note: In the image is says connected, but that is not the case.
Note2: on 5.14 the same graphical bug appears, but goes away (the gray lines goes down) after successfully connecting
I’ve been able to verify this problem only exists on kernel 5.15.2-2 (5.14.18-1 works fine)
P.S.: While writing this post I’ve noticed my mouse failed, then my keyboard and ended up needing to restart my computer. Because of this, I presume it may be a problem with the usb ports on 5.15 (since the Bluetooth on the adapter uses a USB header). That would also explain why the Wifi still works fine.
Wifi adapter: Intel AX200
Motherboard: Gigabyte AB350M-DS3H V2
CPU: Ryzen 3 PRO 2200g
I looked the manufacturers website, and the latest bios said that had a fix for BT devices recovery unstable issue so I updated the bios… I did all this, and now I suspend the laptop without issues, my logitech ergo m575 now reconnects without having to restart the pc after going to suspend.