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 41A72298CD7 for ; Tue, 20 Jan 2026 22:27:21 +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=1768948042; cv=none; b=IgbDkBNm+zhnIoytM6uq7kQdBKUqoEQIXgDcsHpTh0ntb9mfos5WweiBmBBNakW4O3eXaz7Lr1z4T7wVUQqGxb1r820pTd8oU5ffdVAQKadfuvJg6oOnfZimvBlylkF38/qJf+Xic0YlcN/gMYZI5/u5T/CGZEZ7BLDPyFOPFjM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768948042; c=relaxed/simple; bh=w75EsTL0YGeLeWfpIcIPpdk63q9ml/wIFv2OcnHt3Q0=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=NqPG3FSdk8l7Igbg/EO6JBxjb3JQ8iu+I4D9H8N+bNQ4M8tWubsScpBBhOsNOj+RpiVJLDCaN/VSme0CXHpeKxFiuKyU0n+jXPS1OSqZiZqTSx0RHjJiOvcECSA8qUK5dnrlsBbc8/ZSKbgfAGmuMZiKC25bnBUGsBUGuTsf5Bg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UEOH9Yjf; 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="UEOH9Yjf" Received: by smtp.kernel.org (Postfix) with ESMTPS id E80CDC19421 for ; Tue, 20 Jan 2026 22:27:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768948040; bh=w75EsTL0YGeLeWfpIcIPpdk63q9ml/wIFv2OcnHt3Q0=; h=From:To:Subject:Date:In-Reply-To:References:From; b=UEOH9YjfdCW9sn9sL1anpOw7uuap+LN87LEalwVTbzB12Swu/kFjfKeEKQIRWUTGD gp8I5RxLp5lcOksjtCW2CcEqHo0m78bkLo7is8TwY+Gxg2v7t9vfH7D2O0d0ZKFKph GwNd6lmBGKomYLBM2s/BtYptzRmD1lrtZCgW8oEIi3Hc9+kf1FewJf42oLwA5sa2HR +djSn0zIyfuQtsM8aAkk0uTF6hcybRY92FpWbwjzBoTnyy6H52/H/T9prPgD2Z2P5Y 88zutSnG0eK7srqik+HpsfwglOT3NOmckFYmxNCKdpoov8z5vYrnLr4+BuYVvJO/AB XR+wtxD8lBZJA== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id DB682C41612; Tue, 20 Jan 2026 22:27:20 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-bluetooth@vger.kernel.org Subject: [Bug 220986] MediaTek MT7925 Bluetooth adapter (USB 13d3:3596) fails to initialize - reports as unsupported hardware variant 0x7902 Date: Tue, 20 Jan 2026 22:27:20 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed 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: REOPENED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: linux-bluetooth@vger.kernel.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_status resolution Message-ID: In-Reply-To: References: 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 Alex (aamolodc@gmail.com) changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |REOPENED Resolution|DUPLICATE |--- --- Comment #2 from Alex (aamolodc@gmail.com) --- I respectfully request this bug be reopened as it represents a different is= sue than bug #220682. ## Key Difference **Bug #220682 (USB ID 0489:e111):** - Bluetooth worked initially after boot - Stopped working after GNOME login (timing-sensitive) - Fixed by libmtp/libgphoto2 blacklist updates **This bug #220986 (USB ID 13d3:3596):** - Bluetooth NEVER initializes, even at boot - Fails before GNOME login occurs - NOT fixed by libmtp/libgphoto2 updates ## Testing Completed (2026-01-21) I have installed the corrected package updates: - libmtp-1.1.22-2.fc43.x86_64 (includes 13d3:3596 blacklist) - libgphoto2-2.5.33-1.fc43.x86_64 (includes 13d3:3596 blacklist) Performed full cold boot procedure: 1. Complete shutdown (not reboot) 2. Unplugged power for 30+ seconds 3. Booted directly to Linux (no Windows boot first) ## Current Status Bluetooth still fails with identical error: ``` [ 19.247336] Bluetooth: hci0: Opcode 0x0c03 failed: -110 ``` System details: - USB device detected: Bus 001 Device 003: ID 13d3:3596 IMC Networks Wireless_Device - btusb driver binds correctly to interfaces 0 and 1 - hci0 device created in /sys/class/bluetooth/ - Firmware exists: /lib/firmware/mediatek/mt7925/BT_RAM_CODE_MT7925_1_1_hdr= .bin - HCI_Reset command times out (error -110 =3D ETIMEDOUT) - Chip does not respond to any HCI commands - No firmware loading attempted (fails before that stage) ## Root Cause Analysis The libmtp/libgphoto2 fix resolved the USB ID conflict, but a **second, independent issue remains**: the btusb driver cannot communicate with the MT7925 chip at the hardware level. The chip does not respond to HCI_Reset or any other HCI commands. This is a kernel driver initialization bug, not a userspace library conflic= t. ## Evidence This Is Different 1. **Timing:** Bug #220682 worked until login; this bug fails immediately at boot 2. **No gvfs interaction:** Bluetooth fails before any GNOME services start 3. **Package updates don't help:** libmtp/libgphoto2 blacklists are install= ed but issue persists 4. **Cold boot doesn't help:** Full power cycle completed, issue remains 5. **Hardware works:** Device functions correctly in Windows 11 ## Request Please reopen this bug as a separate kernel driver issue. The USB ID confli= ct fix (bug #220682) is necessary but not sufficient to resolve this bug. System: Fedora 43, Kernel 6.18.5-200.fc43.x86_64 Hardware: MediaTek MT7925 (USB ID 13d3:3596, AzureWave 6040 subsystem) --=20 You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.=