From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755139AbcBPMxr (ORCPT ); Tue, 16 Feb 2016 07:53:47 -0500 Received: from mail-wm0-f42.google.com ([74.125.82.42]:38417 "EHLO mail-wm0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755223AbcBPMxn (ORCPT ); Tue, 16 Feb 2016 07:53:43 -0500 Date: Tue, 16 Feb 2016 13:54:09 +0100 From: Daniel Vetter To: Oleksandr Natalenko Cc: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= , Daniel Vetter , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Daniel Vetter , Sonika Jindal , Shashank Sharma , Gary Wang Subject: Re: [REGRESSION] i915: No HDMI output with 4.4 Message-ID: <20160216125409.GC32705@phenom.ffwll.local> Mail-Followup-To: Oleksandr Natalenko , Ville =?iso-8859-1?Q?Syrj=E4l=E4?= , Daniel Vetter , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Sonika Jindal , Shashank Sharma , Gary Wang References: <4a6e01cc374f7a120b5baab7b41f1951@natalenko.name> <20160211092639.GX23290@intel.com> <20160211140117.GC23290@intel.com> <1059a4b341fb208959a262f8706fae87@natalenko.name> <20160212232329.GS23290@intel.com> <20160215144234.GV23290@intel.com> <20160215154215.GM11240@phenom.ffwll.local> <20e547eacc03eef67541c56e85612d0c@natalenko.name> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20e547eacc03eef67541c56e85612d0c@natalenko.name> X-Operating-System: Linux phenom 4.3.0-1-amd64 User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 16, 2016 at 12:58:56PM +0200, Oleksandr Natalenko wrote: > Ville, Daniel, > > I've just got another monitor and another DVI-HDMI cable, and here what I've > got. > > ===Single Link DVI-D cable with 3 different monitors=== > > Computer DVI ——— DVI-D (Single Link)/HDMI cable ——— HDMI LG 23MP65HQ-P === > not working I presume the above LG screen is what you've called previously "old monitor"? > Computer DVI ——— DVI-D (Single Link)/HDMI cable ——— HDMI LG 23MP67HQ-P === > not working > Computer DVI ——— DVI-D (Single Link)/HDMI cable ——— HDMI LG 23MP55HQ-P === > works! > > ===Dual Link DVI-D cable with monitor that doesn't work with Single Link > cable=== > > Computer DVI ——— DVI-D (Dual Link)/HDMI cable ——— HDMI LG 23MP65HQ-P === > works! Funky. Can you pls grab the debug logs (with the special patches from Ville) for this case? I wonder why suddenly different cable and it works. Also: Is this one of these older-ish screens where you must have a dual-link cable to drive it at full resolution&refresh rate? -Daniel > ===Laptop with HDMI output=== > > Laptop HDMI ——— HDMI/HDMI cable ——— HDMI LG 23MP65HQ-P === works! > > I'd say that single link DVI cables are broken with new kernel, but one of > monitors could work with such a cable. So I have no idea :(. > > Regards, > Oleksandr. > > 15.02.2016 17:42, Daniel Vetter wrote: > >The other downside is that it'll make us non-compliant, which was the > >point of this entire ordeal: HDMI spec forbids us from starting any i2c > >transactions when the hpd isn't signalling a present screen. > > > >So maybe we need to buy one of these broken screens. > > > >Oleksandr, what exact model are you using? And any chance that you could > >test this on some other machine with intel gfx and latest kernel, just to > >make sure this really is some issue with the sink and not with the machine > >itself? And I guess you've tested with some other hdmi sink, and that > >works? -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch