[Bug 220986] MediaTek MT7902 Bluetooth adapter (USB 13d3:3596) - missing kernel support for hardware variant 0x7902

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220986

--- Comment #4 from Alex (aamolodc@gmail.com) ---
UPDATE 2026-01-21: Root cause identified, kernel fix still needed

CORRECTION: This chip is MT7902, not MT7925.
Evidence:
- PCIe ID: 14c3:7902 ("MT7902 802.11ax PCIe Wireless Network Adapter")
- Hardware variant reports: 0x7902
- Firmware build: 20220107141051

KERNEL CHANGES REQUIRED:

1. drivers/bluetooth/btusb.c - Add USB ID:
   { USB_DEVICE(0x13d3, 0x3596), .driver_info = BTUSB_MEDIATEK |
BTUSB_WIDEBAND_SPEECH }

2. drivers/bluetooth/btmtk.c - Add hardware variant 0x7902 to switch statement:
   case 0x7902:
   (alongside existing 0x7922, 0x7925, 0x7961)

3. linux-firmware - Include MT7902 Bluetooth firmware
(BT_RAM_CODE_MT7902_1_1_hdr.bin)

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