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 X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41118C3A5A1 for ; Wed, 28 Aug 2019 13:19:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 17B6522CED for ; Wed, 28 Aug 2019 13:19:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726457AbfH1NTs (ORCPT ); Wed, 28 Aug 2019 09:19:48 -0400 Received: from mga06.intel.com ([134.134.136.31]:61722 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726315AbfH1NTr (ORCPT ); Wed, 28 Aug 2019 09:19:47 -0400 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 28 Aug 2019 06:19:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,441,1559545200"; d="scan'208";a="197556912" Received: from lahna.fi.intel.com (HELO lahna) ([10.237.72.157]) by fmsmga001.fm.intel.com with SMTP; 28 Aug 2019 06:19:44 -0700 Received: by lahna (sSMTP sendmail emulation); Wed, 28 Aug 2019 16:19:43 +0300 Date: Wed, 28 Aug 2019 16:19:43 +0300 From: Mika Westerberg To: Brad Campbell Cc: linux-kernel@vger.kernel.org, michael.jamet@intel.com, YehezkelShB@gmail.com Subject: Re: Thunderbolt DP oddity on v5.2.9 on iMac 12,2 Message-ID: <20190828131943.GZ3177@lahna.fi.intel.com> References: <472bee84-d62b-bfcb-eb83-db881165756b@fnarfbargle.com> <20190828073302.GO3177@lahna.fi.intel.com> <7c9474d2-d948-4d1d-6f7b-94335b8b1f15@fnarfbargle.com> <20190828102342.GT3177@lahna.fi.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo User-Agent: Mutt/1.12.1 (2019-06-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 28, 2019 at 06:43:35PM +0800, Brad Campbell wrote: > On 28/8/19 6:23 pm, Mika Westerberg wrote: > > > On Wed, Aug 28, 2019 at 05:12:00PM +0800, Brad Campbell wrote: > > > > Apart from the warning in the log (which is not fatal, I'll look into > > it) to me the second path setup looks fine. > > > > Can you do one more experiment? Boot the system up without anything > > connected and then plug both monitors. Does it work? > > > > Aside from head ordering issues in X it works just fine. > I've attached the dmesg. Boot with nothing plugged in, then plug in 0-1 and > 0-3 in that order. OK, thanks for checking. So when Linux is in complete control both DP tunnels get created properly. I suspect there is something different what the firmware does compared to other Macs I've been using and that causes the driver to fail to discover all the paths. I will take a look at this but I'm away tomorrow and friday so it goes to next week. BTW, have you tried to chain the two monitors?