Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754523Ab2FOIXO (ORCPT ); Fri, 15 Jun 2012 04:23:14 -0400 Received: from hera.cwi.nl ([192.16.191.8]:48850 "EHLO hera.cwi.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752382Ab2FOIXM (ORCPT ); Fri, 15 Jun 2012 04:23:12 -0400 Message-ID: <4FDAF0E5.3040005@cwi.nl> Date: Fri, 15 Jun 2012 09:23:01 +0100 From: "Wouter M. Koolen" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.4) Gecko/20120510 Icedove/10.0.4 MIME-Version: 1.0 To: "Brown, Len" CC: Dave Airlie , "Wouter M. Koolen" , "intergalactic.anonymous@gmail.com" , "linux-kernel@vger.kernel.org" , Daniel Vetter , "Zhang, Rui" Subject: Re: [3.4 regression] [bisected] DisplayPort fails to come on References: <4FD9E69A.4090708@cwi.nl> <1A7043D5F58CCB44A599DFD55ED4C9481FCA16A8@FMSMSX108.amr.corp.intel.com> In-Reply-To: <1A7043D5F58CCB44A599DFD55ED4C9481FCA16A8@FMSMSX108.amr.corp.intel.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1748 Lines: 48 On 06/14/2012 10:52 PM, Brown, Len wrote: > Please test the latest patch here: > > https://bugzilla.kernel.org/show_bug.cgi?id=43168 (Now without the HTML) Hi Len, First let me apologise for the confusion. I grouped two error messages that apparently are not related: kernel: video: probe of LNXVIDEO:00 failed with error -5 kernel: [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting We resolved my problem (a blank second monitor attached to the displayport) and got rid of the second error message by reverting 092945e11c5b84f66dd08f0b87fb729715d377bc. The first message remains, and I interpret your suggestion as trying to get rid of that too. The difficulty for me is that I do not see any symptoms resulting from this error message. In particular the backlight controls (Fn-F4/5) work fine. I do not know what /devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2c/LNXVIDEO:00/input/input4 means, how I activate it, and what goes awry when its probing fails. Then again, I think there must be something to your pointer, since I see indeed in dmesg [Firmware Bug]: ACPI(PEGP) defines _DOD but not _DOS At any rate, without that patch this error message is displayed: kernel: video: probe of LNXVIDEO:00 failed with error -5 With the patch I see instead input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2c/LNXVIDEO:00/input/input4 That does look more friendly, but I am at a loss to tell you what really got improved. Please help. Wouter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/