[Bug 221539] MT7925 Bluetooth fails to initialize since kernel 7.0.8 — regression from 7.0.5

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221539

kopper (niko.iskanius@duckpolice.com) changed:

           What    |Removed                     |Added
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                 CC|                            |niko.iskanius@duckpolice.co
                   |                            |m

--- Comment #1 from kopper (niko.iskanius@duckpolice.com) ---
Same behavior, when upgrading kernel on Debian Trixie (Stable) from 6.12.86 to
6.12.88.

**Hardware:**
- ASUS ROG STRIX B650E-I GAMING WIFI
- WiFi/BT chip: MediaTek MT7922
- PCIe ID: MEDIATEK Corp. MT7922 802.11ax
- BT interface: USB (hci0)

**Working kernel:** 6.12.86
**Broken kernel:** 6.12.88
**Firmware:** firmare-mediatek 20250410
(mediatek/BT_RAM_CODE_MT7922_1_1_hdr.bin)
**Distro:** Debian 13.5 (stable)

**Symptoms**
Identical to original report.

**dmesg (relevant lines):**
Bluetooth: Core ver 2.22
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
Bluetooth: L2CAP socket layer initialized
Bluetooth: SCO socket layer initialized
Bluetooth: hci0: HW/SW Version: 0x008a008a, Build Time: 20260224103448
Bluetooth: hci0: Failed to send wmt func ctrl (-22)
Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is
advertised, but not supported.
Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Bluetooth: BNEP filters: protocol multicast
Bluetooth: BNEP socket layer initialized

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