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 0CB353E9F8F for ; Tue, 20 Jan 2026 22:35:37 +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=1768948538; cv=none; b=oDZJzqnC3eeJk2NvkhtdVvzjbypUfuerxza808sU6em6OTR94P0Q15G9fOnihkX6pOwtuexDgeo+p+jK1y6aUy/uQueF30X+ZRzKSRDT7IlF7K8AQ4NQ2maxYORL1mO4Jpgx3JzfQt0BOJad662mZOQkUGoBbk2HrINb8DUfT50= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768948538; c=relaxed/simple; bh=+aFp34IhC8Eep6BdhtnpWwkGm2j4IZkfEZzm0DpxHVI=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=gh+fJYF+5jeINhQNuW9NYt2sxH4DE8PMY3TLjeRXjxMyJDah0wTTPRQrLYdgp6rYl6U4o9KBFlb76E5AXV8C/MKmzA2XVQZ3pGTSoMHVz77fIeZOE/YIw15S1ddRZTYtPG9Q0RpQbtB+OV2W4z2XPT8o0pL78TD8EVW0ffAoDQc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SlPNAolV; 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="SlPNAolV" Received: by smtp.kernel.org (Postfix) with ESMTPS id 7F348C19425 for ; Tue, 20 Jan 2026 22:35:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768948537; bh=+aFp34IhC8Eep6BdhtnpWwkGm2j4IZkfEZzm0DpxHVI=; h=From:To:Subject:Date:In-Reply-To:References:From; b=SlPNAolV5PiuOZovmydq6DafkROMLZLFBuikwBJfUtA8zM0aNAxRH715PPQtrFJYw JdO661SFvi7KcH92rcF3k/tqiuPgKQSSE8E6ZozoT7OW/x0pmY0Lgy+pEdDyTpwNwp 55hLrxDkwUtJtqS83pgFlk/TD9xPp1qt3yl/dCiq6UDmLU+/mnf+CSZ/Z1YFsmPDhP 6CesXqCCqxIK3kOiuSThGdXcBHpa9e751G7Z8gVMN17+s0NMGlLCS1M7saHkM0fE9E RY4WgM/4skiS4Jx8l2ZbFANdDvLkiU0OVT3XEMy1VZEqk8OEy8Dnx6E5TWrL/iIupR ACCB0F813YMVQ== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 74439C41612; Tue, 20 Jan 2026 22:35:37 +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 22:35:37 +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: 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 --- Comment #3 from Alex (aamolodc@gmail.com) --- additional context: ## What I've Tested (2026-01-21) **1. Applied the USB ID blacklist fixes:** - Installed libmtp-1.1.22-2.fc43.x86_64 (includes 13d3:3596 blacklist) - Installed libgphoto2-2.5.33-1.fc43.x86_64 (includes 13d3:3596 blacklist) **2. Performed full cold boot:** - Shut down completely (not reboot) - Unplugged power cable for 30+ seconds to clear hardware state - Booted directly to Linux (did not boot Windows first) **3. Verified Windows functionality:** - Rebooted to Windows 11 - Bluetooth works perfectly (can pair devices, transfer files, etc.) - This confirms the hardware itself is not defective **4. Returned to Linux:** - Bluetooth still fails with the same error ## Current Behavior in Linux Bluetooth fails immediately at boot, before any desktop environment loads: ``` [ 19.247336] Bluetooth: hci0: Opcode 0x0c03 failed: -110 ``` Technical details: - USB device is detected: `Bus 001 Device 003: ID 13d3:3596 IMC Networks Wireless_Device` - btusb driver binds to the device correctly - hci0 device is created in `/sys/class/bluetooth/` - Firmware file exists: `/lib/firmware/mediatek/mt7925/BT_RAM_CODE_MT7925_1_1_hdr.bin` - **Problem:** HCI_Reset command times out (error -110 =3D ETIMEDOUT) - The chip does not respond to any HCI commands from the Linux driver - Firmware loading is never attempted because the driver fails before that stage ## Why This Is Different From Bug #220682 **Bug #220682 (USB ID 0489:e111):** - Bluetooth worked after boot - Failed only after user logged into GNOME desktop - Caused by libmtp/libgphoto2 probing the device during desktop startup - **Fixed** by blacklisting the USB ID in libmtp/libgphoto2 **This bug #220986 (USB ID 13d3:3596):** - Bluetooth never works, not even for a moment - Fails at boot time, before any desktop environment starts - Fails even with libmtp/libgphoto2 blacklists applied - **Not fixed** by the package updates ## Root Cause There are TWO separate issues affecting USB ID 13d3:3596: 1. **USB ID conflict** (shared with bug #220682) - RESOLVED by package upda= tes 2. **Kernel driver initialization failure** (unique to this bug) - UNRESOLV= ED The btusb driver cannot communicate with the MT7925 chip at the hardware le= vel. Since the same hardware works perfectly in Windows, this indicates the Linux driver is missing vendor-specific initialization code or using an incorrect initialization sequence for this particular chip variant. ## Why Hardware Defect Is Ruled Out - Device works perfectly in Windows 11 (Bluetooth pairs, connects, transfers data) - WiFi portion of the same combo card works in Linux (mt7925 driver) - USB device is detected and enumerated correctly in Linux - This is a software/driver issue, not hardware ## Request Please reopen this bug as a kernel driver issue. The libmtp/libgphoto2 fixes from bug #220682 are necessary but not sufficient to make this device work. **System Information:** - OS: Fedora Linux 43 (Workstation Edition) - Kernel: 6.18.5-200.fc43.x86_64 - Hardware: MediaTek MT7925 Bluetooth/WiFi combo (Filogic 310) - USB ID: 13d3:3596 (IMC Networks) - Subsystem: AzureWave 6040 - Motherboard: ASUS TUF GAMING B650M-E WIFI --=20 You may reply to this email to add a comment. 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