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Bug#1136886: reportbug: Regression in 6.12.88+deb13-amd64 breaks MediaTek mt7921u Bluetooth

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Package: linux-image-6.12.88+deb13-amd64
Version: 6.12.88-1

Dear Debian kernel maintainers,

I found a regression affecting MediaTek mt7921u Bluetooth devices.

Bluetooth works correctly with:

```
6.12.86+deb13-amd64
```

but fails consistently with:

```
6.12.88+deb13-amd64
```

Symptoms:

* btmgmt info shows:
  Index list with 0 items
* hciconfig hci0 up fails with:
  Can't init device hci0: Invalid argument (22)

Relevant dmesg output:

```
Bluetooth: hci0: Failed to send wmt func ctrl (-22)
Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is advertised, but not supported.
```

Hardware:

* MediaTek mt7921u USB wireless/bluetooth adapter

The device is detected correctly by the kernel, but Bluetooth initialization fails only on 6.12.88.

This appears to be a regression between 6.12.86 and 6.12.88.

Please let me know if additional logs or testing are needed.

Best regards

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Bug#1136886: reportbug: Regression in 6.12.88+deb13-amd64 breaks MediaTek mt7921u Bluetooth Antonio López Fernández <antonio.angel.lopez.fernandez@gmail.com> - 2026-05-16 22:10 +0200

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