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 2FBDB13B5A6 for ; Sat, 10 Aug 2024 19:37:45 +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=1723318665; cv=none; b=PDHD+9wMgxAlDspT8H4ANNh3lbVXtmnJn0IICtfQfHLudR3/nxtNbA3RJyL5N1JFMSMdnO0yw63xu4nmO507Z+2x1M9oV/naSTMynIozba6LswSUwcflMZ1AHnutdyx8/4LvDvRWUSHRLuWTFG+ZD4P+O2Ghfq/HUjOQhxw0vtc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723318665; c=relaxed/simple; bh=PPk+9CLgJn5nViTXeA6IYHL+4ItGe7WJTnP6XeSxNDA=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=bMt64AFHkh27aycwu/qWwxnTGdEuvrXPUltNL6YwOEziQvtBHFIC/k/N2ZTmyC8kTW4AzSHWmmYp1XRAnMP84MXntJWQSG7zAA9gcGH0hr7IwzQXrvr1w2/14HSOzHcPdaHojw6X4AdWsl+3VL5fh5dOBYRHMAbEdQfN519y5jA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RsBxP5mu; 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="RsBxP5mu" Received: by smtp.kernel.org (Postfix) with ESMTPS id 04B1FC4AF0D for ; Sat, 10 Aug 2024 19:37:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1723318665; bh=PPk+9CLgJn5nViTXeA6IYHL+4ItGe7WJTnP6XeSxNDA=; h=From:To:Subject:Date:In-Reply-To:References:From; b=RsBxP5mu9VkAoLbVmcR+XZGjsakrhyQrohGwqucyEb83/Zg3SYIXlh2bhlfFDT2FI u1LpZCrpEYHHjWG2R8/XhsFK606Esb2/pjMWA+5kCG3ozaIvSB3tBZ8ilaq1cFFU4I Bul9DSTRDJNsc3SFRzusedMeASIeksbcYKI9cM0s/ERvhzVPDGex0k8xX2PCEG5q1Q SgnNNXP9Yv0tsOCHcX77qrTUKqcoCKXQ4sbLYnJ7q5rFmcukUGbZw5d0S5DFylEcWD go2QOEiPZkwtP5ed2aFXvtphdJ5vqefYosOYRC8y92dG7d1SSnICZkrGLwSqMc+/IJ n67ut78AKM3MA== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id E21F7C53B50; Sat, 10 Aug 2024 19:37:44 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 219111] Xone:23C mixer not recognized as a 2in/2out device Date: Sat, 10 Aug 2024 19:37:44 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: USB X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: stern@rowland.harvard.edu X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: drivers_usb@kernel-bugs.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-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D219111 --- Comment #55 from Alan Stern (stern@rowland.harvard.edu) --- The really important thing is bNumConfigurations. If it is set to 1 then t= he device doesn't make config 2 available, but if it is set to 2 then the devi= ce does make config 2 available (even if the computer decides to use config 1). The configuration descriptor includes four interfaces. Interface 0 is the audio control interface; it describes two USB terminals (one in, one out) a= nd two audio terminals (one in, one out). It also says that the input termina= ls each have 2 channels (regular stereo). Interfaces 1 and 2 are for audio streaming. Interface 1 is the USB-out connection; it runs at 48000 Hz with 24-bit samples, it can be synchronized= to a clock on the device, and it can also operate in a vendor-specific way.=20 Interface 2 is the USB-in connection; it also runs at 48000 Hz with 24-bit samples and it also has a vendor-specific alternate setting. Interface 3 is for MIDI. As far as I can see, you aren't using it. The packet capture shows the computer issuing a few vendor-specific request= s.=20 I have no way to know what they mean, but they involve getting data from the device, not sending data to the device. So they probably don't affect the = way the device operates. The thing we really need to know is how the Windows driver tells the device= to switch to configuration 2. I haven't seen anything in the packet captures = that show how it does this. (However, the most recent capture shows that at the 361-second mark, the computer deconfigures the device and the sets it back = to configuration 1. I can't tell why that happened.) Or maybe the Windows driver uses the vendor-specific alternate settings rat= her than the standard USB audio class settings. The packet captures don't show= the computer telling the device which alternate setting to use. This must happ= en, because the default setting uses no bandwidth and transfers no audio data, = but it doesn't show up in the packet captures. (It does show up in the usbmon traces.) --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=