From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D5BBC357727 for ; Fri, 16 Jan 2026 09:35:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768556102; cv=none; b=Ea/+C3pq+J7IA3p6Q0aGrNrQMvvM8evcotbyuBr5rOxFrxKOxCxxHWakNpNtJ9/0bEiETu+M1ajixHZ84cDsqFKcGSU4T94fJu35QksOa9SkUZqmkenfatNiYAUvgJDmH82jwzWI/oIWyg5D6wcX7nzkcBKXk0792u6k7P+jLbo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768556102; c=relaxed/simple; bh=xlmRFGoX954HoRklT8/417Bxwkf2QRmEBZE+L4KR+hQ=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=jrH9k2NCUZTAm+rQNcddVwpa7VHQqroXmidvt9R1ueg93bPLzMBk1t59gCq4HyE1HVAzeVVK+nL4hROW1WYz0wddS32ei8hfZ2XiPiWk5yfiCUQI8xo5Ewt3X9wnlgTARQ+EyWLXU3c2NNvZK2/dPZ+CTsUFjClWrfz4qVM/Xxg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CmUggFJQ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CmUggFJQ" Received: by smtp.kernel.org (Postfix) with ESMTPS id 9A583C116C6 for ; Fri, 16 Jan 2026 09:35:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768556101; bh=xlmRFGoX954HoRklT8/417Bxwkf2QRmEBZE+L4KR+hQ=; h=From:To:Subject:Date:From; b=CmUggFJQK3PXj3fWmFlYmk0Rlu+thjHelGTQULptNJ/0XQaMUk4lSsIgTAc6S1LHT 4Hs7Mc+FXMtJaH+RvFCfHXjfTnr3i1kt3vnsw2Gf7vROXh7eih8Qu1dwn3+580wOq1 WDzOTNGbvFu+2FQA3GYjXAALF6lMLQKC3k9F7HBSjLg5r71Cuxo7HnyWnKMcwWd3UF lY2ba/XZTna5JuJ5rz0HzW2rV5YOi4H8VNHsOhJJNH0JKwfr5wfiO9fBP91EMIbef/ QXVnFfXQhnEJClbt591w9RdnxBvWHGssCEcoiTi2zyVyMC41WOZf1ZHZ92yOBnOH+X KGH81NGMZ7Cmw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 89F4BC41612; Fri, 16 Jan 2026 09:35:01 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-bluetooth@vger.kernel.org Subject: [Bug 220986] New: MediaTek MT7925 Bluetooth adapter (USB 13d3:3596) fails to initialize - reports as unsupported hardware variant 0x7902 Date: Fri, 16 Jan 2026 09:35:01 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Drivers X-Bugzilla-Component: Bluetooth X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: blocking X-Bugzilla-Who: aamolodc@gmail.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: linux-bluetooth@vger.kernel.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cf_regression Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D220986 Bug ID: 220986 Summary: MediaTek MT7925 Bluetooth adapter (USB 13d3:3596) fails to initialize - reports as unsupported hardware variant 0x7902 Product: Drivers Version: 2.5 Hardware: Other OS: Linux Status: NEW Severity: blocking Priority: P3 Component: Bluetooth Assignee: linux-bluetooth@vger.kernel.org Reporter: aamolodc@gmail.com Regression: No The MediaTek MT7925 WiFi/Bluetooth combo card with USB ID 13d3:3596 fails to initialize Bluetooth functionality. The chip reports hardware variant 0x7902 instead of the expected 0x7925, causing the btmtk driver to request non-existent firmware (mt7902/BT_RAM_CODE_MT7902_1_1_hdr.bin). When attempting to use MT7925 firmware via symlink, the chip fails with HCI_Reset timeout (Opcode 0x0c03 failed: -110). WiFi functionality works (slowly) via the mt7925 driver, but Bluetooth is completely non-functional. STEPS TO REPRODUCE: 1. Boot Linux with MediaTek MT7925 (USB 13d3:3596) present 2. Observe Bluetooth fails to initialize 3. Check dmesg for firmware load failure or HCI timeout ACTUAL RESULT: - Without firmware symlink: "Direct firmware load for mediatek/mt7902/BT_RAM_CODE_MT7902_1_1_hdr.bin failed with error -2" - With MT7925 firmware symlinked as MT7902: "Opcode 0x0c03 failed: -110" (HCI_Reset timeout) - No Bluetooth controller available EXPECTED RESULT: Bluetooth adapter should initialize and be usable SYSTEM INFORMATION: Kernel: 6.18.5-200.fc43.x86_64 Distro: Fedora 43 (Workstation Edition) USB Device: Bus 001 Device 003: ID 13d3:3596 IMC Networks Wireless_Device Manufacturer: MediaTek Inc. Product: Wireless_Device Loaded modules: btusb, btmtk, bluetooth DMESG OUTPUT: [ 5.657894] usbcore: registered new interface driver btusb [ 5.669557] bluetooth hci0: Direct firmware load for mediatek/mt7902/BT_RAM_CODE_MT7902_1_1_hdr.bin failed with error -2 [ 5.669561] Bluetooth: hci0: Failed to load firmware file (-2) [ 5.669563] Bluetooth: hci0: Failed to set up firmware (-2) [ 5.669565] Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is advertised, but not supported. After symlinking MT7925 firmware as MT7902 and reloading btusb: [ 304.624964] Bluetooth: hci0: Opcode 0x0c03 failed: -110 ANALYSIS: The btmtk driver reads hardware variant 0x7902 from the chip and constructs firmware path accordingly. However: 1. No MT7902 Bluetooth firmware exists in linux-firmware 2. MT7925 firmware is not compatible with the 0x7902 variant (causes HCI timeout) 3. The 0x7902 variant may need specific firmware or driver modifications ADDITIONAL NOTES: - This device works correctly on Windows - WiFi portion of the combo card works (via mt7925 WiFi driver) - Multiple users report similar issues with MT7925 variants on various lapt= ops - Related: Launchpad bug #2078878 --=20 You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.=