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 82F9A1E8326 for ; Wed, 30 Apr 2025 06:35:59 +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=1745994959; cv=none; b=joDpSOS36g/f0F6NyLP+79KKBb+yyUQB7c4LkuFa253Rf/SR1JKO1etLljcoBjlnTz7d5iazy3tVoBlBSBEydTQPw70iVIz9Elq7PHCE9Sqv5HjRoGshiwUnf3m3JE+DzVF5uiVYZf35jxaCfa5H6HUsl3uuIfAC4B+5sDW9654= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745994959; c=relaxed/simple; bh=ERYZexWtwjh8EUtRHvaZY9F0oZ4QNvjigu3PDyDHSFw=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=htfOs93KBMR6QPktgu7pAir2B5konpW6M3FnIOZqD8dAOXQEvY2GeJbpz+3o0KqVI43ev0ODZaEPfG2x3yNo98By8PQsKBbjItg3Rd1JYO4yfrsRRVsXhARUQcibArgjhlLhUEvR0+tnVZQ4kixAuqt2Ybcy6yQi1Lz2h4z9NDM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RD44+UNN; 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="RD44+UNN" Received: by smtp.kernel.org (Postfix) with ESMTPS id 61C26C4CEEA for ; Wed, 30 Apr 2025 06:35:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745994959; bh=ERYZexWtwjh8EUtRHvaZY9F0oZ4QNvjigu3PDyDHSFw=; h=From:To:Subject:Date:In-Reply-To:References:From; b=RD44+UNN1ItdtbdDGALAF2UZlnyFOmiBeo8k299q/Bw61IiBrKeJ4hNbx73x6YtCO CUtGOcUmGjVFUlZM41dq+Lo0+GBRlCXk2kwvkUjqYEjiOYm53WspWw7ndgWdhDv4ty AlHf/zxX7qpq9mgGRH4PuOx6pxhPUSIAC+vfg9cAaUVvbPu56PY9mOFWrvnz8dkxI8 k348LYd2w0e49CZ8HpOZBbd0G9eeOg/oB5JgQ8y/lS3eBzMtxcBW5CGvl9MqMHrLuw 6UIIu1bny7wFTgPk2+9n+i5BGTOnmGv9OeJPlQnKYagP4AKDfDDr4BY6BZL+ll9yg2 QN54xKTIbP4cw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 59BF5C41612; Wed, 30 Apr 2025 06:35:59 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 220027] USB 3.2 capture cards using incorrect USB speed Date: Wed, 30 Apr 2025 06:35:59 +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: michal.pecio@gmail.com 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=3D220027 --- Comment #5 from Micha=C5=82 Pecio (michal.pecio@gmail.com) --- Looks like a problem with those capture devices, then. Maybe they all use t= he same chip? One name I have seen somewhere is Realtek RTD2801VPF. It could be what Mathias Nyman suggested in the other bug: the device expec= ts some particular order of descriptor requests (as issued by Windows) and doe= sn't know what to do when Linux does similar things in other order. It would be a little weird that such a bug only occurs at 10G speed, but hardware can be = all sorts of buggy... To test this theory it would be necessary to patch the kernel and observe w= hat happens. Can you build the kernel from source, are you familiar with C programming by any chance? Another possible approach is to sniff the USB bus with Wireshark on Windows= and on Linux and compare. Disclaimer: I have never really used Wireshark on Win= dows before, so IDK how usable it is, and any changes to Linux behavior would st= ill require kernel patches of course. --=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.=