[Bug 221521] New: Bluetooth: btusb/mt7921 - Failed to send wmt func ctrl (-22) on MediaTek MT7921 combo adapter

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221521

            Bug ID: 221521
           Summary: Bluetooth: btusb/mt7921 - Failed to send wmt func ctrl
                    (-22) on MediaTek MT7921 combo adapter
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: blocking
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: txxlc@pm.me
        Regression: No

On kernel 7.0.7, the Bluetooth portion of the MediaTek MT7921 PCIe combo
adapter fails to initialize. The btusb driver detects the device (hci0), but
initialization aborts with:
Bluetooth: hci0: Failed to send wmt func ctrl (-22)
As a result, bluetoothd starts successfully but reports no available
controllers. bluetoothctl list returns empty, and GUI managers (blueman,
bluedevil) cannot enable the adapter. RFKill shows no software/hardware blocks.
The Wi-Fi portion (mt7921e) initializes and works correctly.

Steps to Reproduce
    1. Boot system with kernel 7.0.7
    2. Check dmesg | grep -iE 'bluetooth|btusb|mt7921'
    3. Run bluetoothctl list
    4. Observe Failed to send wmt func ctrl (-22) in kernel log and No default
controller available in BlueZ

Relevant logs:
% sudo dmesg | grep -A2 -B2 'wmt func ctrl'
[    6.063435] input: HD-Audio Generic Mic as
/devices/pci0000:00/0000:00:08.1/0000:04:00.6/sound/card1/input16
[    6.063488] input: HD-Audio Generic Headphone as
/devices/pci0000:00/0000:00:08.1/0000:04:00.6/sound/card1/input17
[    6.078123] Bluetooth: hci0: Failed to send wmt func ctrl (-22)
[    6.078129] Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection
command is advertised, but not supported.
[    6.133913] mt7921e 0000:03:00.0: HW/SW Version: 0x8a108a10, Build Time:
20260224110909a

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