[Bug 221521] 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

xyukta@gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |xyukta@gmail.com

--- Comment #18 from xyukta@gmail.com ---
I can reproduce this on another MT7921 system.

Hardware
Lenovo laptop
MT7921 PCIe Wireless Network Adapter
PCI ID: 14c3:7961
Bluetooth USB: 0489:e0cd

Distribution
Void Linux

Working kernel
6.12.74_1

Broken kernel
6.18.32_1

This is a regression.

Bluetooth works normally on Linux 6.12.74.

After booting Linux 6.18.32:
bluetoothctl list returns no controllers.
bluetoothctl show reports No default controller available.
bluetui shows an empty interface because no controller is available.

The Bluetooth USB device is detected and bound to btusb, and
/sys/class/bluetooth/hci0 exists.

Additional kernel messages after the initial error include:

Bluetooth: hci0: Execution of wmt command timed out
Bluetooth: hci0: Failed to send wmt patch dwnld (-110)
Bluetooth: hci0: Failed to set up firmware (-110)

Booting the already-installed 6.12.74 kernel immediately restores Bluetooth
without changing firmware or userspace.

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