Same problem on my system, ASUS mainboard with Ryzen CPU and MediaTek wireless.
6.12.85+deb13 working
6.12.86+deb13 working
6.12.88+deb13 not working
Note that WLAN with the same device is up and working with all kernels.
Thanks and regards
Stephan
07:00.0 Network controller: MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless
Network Adapter
*-usb:0
description: Bluetooth wireless interface
product: Wireless_Device
vendor: MediaTek Inc.
physical id: 6
bus info: usb@3:6
version: 1.00
serial: 000000000
capabilities: usb-2.10 bluetooth
configuration: driver=btusb maxpower=100mA
speed=480Mbit/s
[ 99.912986] Bluetooth: Core ver 2.22
[ 99.912997] NET: Registered PF_BLUETOOTH protocol family
[ 99.912999] Bluetooth: HCI device and connection manager initialized
[ 99.913001] Bluetooth: HCI socket layer initialized
[ 99.913003] Bluetooth: L2CAP socket layer initialized
[ 99.913007] Bluetooth: SCO socket layer initialized
[ 100.145293] Bluetooth: hci0: HW/SW Version: 0x008a008a, Build Time:
20241106163512
[ 100.300248] Bluetooth: hci0: Failed to send wmt func ctrl (-22)
[ 100.300273] Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection
command is advertised, but not supported.
[ 101.787538] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 101.787541] Bluetooth: BNEP filters: protocol multicast
[ 101.787544] Bluetooth: BNEP socket layer initialized
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