From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 42AD2C433EF for ; Sat, 11 Jun 2022 16:29:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233365AbiFKQ3i (ORCPT ); Sat, 11 Jun 2022 12:29:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233120AbiFKQ3g (ORCPT ); Sat, 11 Jun 2022 12:29:36 -0400 Received: from mail-lj1-x22c.google.com (mail-lj1-x22c.google.com [IPv6:2a00:1450:4864:20::22c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 90A684F47B for ; Sat, 11 Jun 2022 09:29:33 -0700 (PDT) Received: by mail-lj1-x22c.google.com with SMTP id l18so2052713lje.13 for ; Sat, 11 Jun 2022 09:29:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:subject:from:to:cc:date:in-reply-to:references :content-transfer-encoding:user-agent:mime-version; bh=X1nDz0NffzQJOCQZW1tF8EhKqJz6ggp/Xyqs7aWNBlc=; b=NvM77AsQW8matgf0LTMDXu9/46wijoq/BAfost7cjwmgTl2QgySxu38WoHMAuRJBG7 dZlkAzVEZPvX4fWdyLgKzkzA/A5Hbw29XZRuskAyVW9JguMuo/3GK020ipfdZDQbyrMh 4wgXdrIPOQ0j3awVSfjVbfZboQ9CVP7bqFj55t4bSy2gJt+PYy3EYJBAKbXyRBS1CaDY W1HFEvgOG50VjHt9yu4FUYJygEK7UDComnzUUTiCsxK/3d3ZDiPhGB05FLtaSv4H8ox4 B+Q/l7igTYpcjGDH/yPM640q5RalB1v5XqjE5HWO0/FpuJTSebpwVqo3R+OmwUgSc1Vn CZzA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:subject:from:to:cc:date:in-reply-to :references:content-transfer-encoding:user-agent:mime-version; bh=X1nDz0NffzQJOCQZW1tF8EhKqJz6ggp/Xyqs7aWNBlc=; b=6o9oUD7pkmE355S2aCs/LIiy7Fsu03Wy1NLI8z204pBaSaEgssU2EbzpoSN1LtYuMd IkkMX443FJvXCfWcLeuV55Fko4iS8KLxjmq4JTvM5svzSi6ntXVpyz8ecgYSol9LP3Xg ckOR68TFAIdbT+EEVNMzq74MuSzku3ib4IZZpCF5jfJrt99ryCJlmF2XLxVs/2R7yW2J OeWag/Dztoyie40cjpLdMAlnC1yANEl7DiJt87K1lrnKnaKYiYcyfjNMId9Z/cJpfZgt fmG4MuhizSxEoyBzY3FdMrVzpaPYnV17I9fB6+rHBBaqcUuuDjoT/0fmEUdRQKLRyT3F kD9Q== X-Gm-Message-State: AOAM532pzX0KNubmwNgpdw3B2oqtplF0rJlWTk4yw7VvyeqRv8M4J3hN jDeGNn5s6Wroff32t0p2rlfF0rdWoJ/6SA== X-Google-Smtp-Source: ABdhPJzWDP7B/p4xGpsR9mEouM+YH2T9TotJ+yVFq/J1djQCVrecRkpvkgEPvDAIt+LrVoppqQHgLQ== X-Received: by 2002:a05:651c:4c9:b0:255:aeac:91e0 with SMTP id e9-20020a05651c04c900b00255aeac91e0mr12480663lji.449.1654964971805; Sat, 11 Jun 2022 09:29:31 -0700 (PDT) Received: from [192.168.1.168] (078088109026.wroclaw.vectranet.pl. [78.88.109.26]) by smtp.gmail.com with ESMTPSA id m4-20020a056512114400b00478e9b28fe4sm310348lfg.80.2022.06.11.09.29.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 11 Jun 2022 09:29:30 -0700 (PDT) Message-ID: <494c3280c58455b2439559f1b48858caf22b8c8f.camel@gmail.com> Subject: Re: Thunderbolt: One missing DisplayPort? From: Tomasz =?UTF-8?Q?Mo=C5=84?= To: Mika Westerberg Cc: Stefan Hoffmeister , Heikki Krogerus , linux-usb@vger.kernel.org Date: Sat, 11 Jun 2022 18:29:28 +0200 In-Reply-To: References: <92ab08fe65c12d6159966bdd7d2c4215044a00ff.camel@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.44.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Wed, 2022-06-08 at 16:27 +0200, Tomasz Mo=C5=84 wrote: > On Fri, 2022-06-03 at 08:04 +0300, Mika Westerberg wrote: > > On Thu, Jun 02, 2022 at 09:34:27PM +0200, Tomasz Mo=C5=84 wrote: > > > How do I determine that the cable is non-Thunderbolt Type-C? > >=20 > > It does not have that "lightning" logo on the connector. >=20 > I got two more (to a total of 4) cables without lightning logo and all > seem to enter Thunderbolt mode. I managed to get an active 3 meters long USB Type-C cable. It is both a directional cable (meaning the host end has to be plugged into laptop and sink into dock) and appear to have working display port only when connected with correct plug orientation. That is, rotating USB-C plug 180 degrees switches between working DP altmode and non-working. The active cable I have features retimer in the middle of the cable. The retimer is definitely noticeable (it is bulky) and does get warm when in use. This cable indeed does inhibit Thunderbolt operation and dock status in boltctl is disconnected. The EMCA information for the active cable is below. Even though the cable is 3 meters long it claims to be 2 meters. Type Active Cable Vendor Unknown (0x0bda) Specs [ <20ns (~2m) ] [ 20V ] [ 3A ] [ USB3 10Gbps ] VER HW:0001 FW:0002 VDO:0 v:2 Vdo object hex IdHeader 0x24000bda CertStat 0x00000000 Product 0x00000209 Cable 0x120851b2 SVISD 0x0bdaff01 TBT3/4 0x00000000