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Bug#1136790: Bluetooth stopped working with kernel 6.12.88

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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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Thread

Bug#1136790: mt7921e: bluetooth is broken with "Bluetooth: hci0: Failed to send wmt func ctrl (-22)" Anton Shestakov <av6@dwimlabs.net> - 2026-05-16 00:20 +0200
  Bug#1136790: mt7921e: bluetooth is broken with "Bluetooth: hci0: Failed to send wmt func ctrl (-22)" Antonio Russo <aerusso@aerusso.net> - 2026-05-16 04:10 +0200
  Bug#1136790: mt7921e: bluetooth is broken with "Bluetooth: hci0: Failed to send wmt func ctrl (-22)" Steinar Bang <sb@dod.no> - 2026-05-16 10:40 +0200
  Bug#1136790: mt7921e: bluetooth is broken with "Bluetooth: hci0: Failed to send wmt func ctrl (-22)" Andreas Sundstrom <sunkan+debian.bugs@zappa.cx> - 2026-05-16 12:00 +0200
  Bug#1136790: Bluetooth stopped working with kernel 6.12.88 Stephan Verbücheln <verbuecheln@posteo.de> - 2026-05-18 21:00 +0200

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