From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761430AbcHaVvl (ORCPT ); Wed, 31 Aug 2016 17:51:41 -0400 Received: from mga03.intel.com ([134.134.136.65]:8974 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759415AbcHaVvf (ORCPT ); Wed, 31 Aug 2016 17:51:35 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.30,263,1470726000"; d="scan'208";a="3304018" From: "Zanoni, Paulo R" To: "dri-devel@lists.freedesktop.org" , "James.Bottomley@HansenPartnership.com" , "intel-gfx@lists.freedesktop.org" CC: "linux-kernel@vger.kernel.org" Subject: Re: [Intel-gfx] Skylake graphics regression: projector failure with 4.8-rc3 Thread-Topic: [Intel-gfx] Skylake graphics regression: projector failure with 4.8-rc3 Thread-Index: AQHSA9HXQv/fyF54g0i/G+t1O9LkHw== Date: Wed, 31 Aug 2016 21:51:34 +0000 Message-ID: <1472680290.2387.219.camel@intel.com> References: <1472217035.5189.50.camel@HansenPartnership.com> <1472667806.2316.42.camel@HansenPartnership.com> <1472679836.2316.65.camel@HansenPartnership.com> In-Reply-To: <1472679836.2316.65.camel@HansenPartnership.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.254.179.163] Content-Type: text/plain; charset="utf-8" Content-ID: <40F30A756E8C5F4994894373B0E9743F@intel.com> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id u7VLprlI007924 Hi Em Qua, 2016-08-31 às 14:43 -0700, James Bottomley escreveu: > On Wed, 2016-08-31 at 11:23 -0700, James Bottomley wrote: > > > > On Fri, 2016-08-26 at 09:10 -0400, James Bottomley wrote: > > > > > > We seem to have an xrandr regression with skylake now.  What's > > > happening is that I can get output on to a projector, but the  > > > system is losing video when I change the xrandr sessions (like  > > > going from a --above b to a --same-as b).  The main screen goes  > > > blank, which is basically a reboot situation.  Unfortunately, I  > > > can't seem to get the logs out of systemd to see if there was a  > > > dump to dmesg (the system was definitely responding). > > > > > > I fell back to 4.6.2 which worked perfectly, so this is > > > definitely  > > > some sort of regression.  I'll be able to debug more fully when > > > I  > > > get back home from the Linux Security Summit. > > > > I'm home now.  Unfortunately, my monitor isn't as problematic as > > the > > projector, but by flipping between various modes and separating and > > overlaying the panels with --above and --same-as (xrandr), I can > > eventually get it to the point where the main LCD panel goes black  > > and can only be restarted by specifying a different mode. > > > > This seems to be associated with these lines in the X > > > > [ 14714.389] (EE) intel(0): failed to set mode: Invalid argument > > [22] > > > > But the curious thing is that even if this fails with the error  > > message once, it may succeed a second time, so it looks to be a  > > transient error translation problem from the kernel driver. > > > > I've attached the full log below. > > > > This is only with a VGA output.  I currently don't have a HDMI  > > dongle, but I'm in the process of acquiring one. > > After more playing around, I'm getting thousands of these in the > kernel > log (possibly millions: the log wraps very fast): > > [23504.873606] [drm:intel_dp_start_link_train [i915]] *ERROR* failed > to train DP, aborting > > And then finally it gives up with  > > [25023.770951] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] > *ERROR* CPU pipe B FIFO underrun > [25561.926075] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] > *ERROR* CPU pipe A FIFO underrun > > And the crtc for the VGA output becomes non-responsive to any > configuration command.  This requires a reboot and sometimes a UEFI > variable reset before it comes back. Please see this discussion: https://patchwork.freedesktop.org/patch/103237/ Do you have this patch on your tree? Does the problem go away if you revert it? Thanks, Paulo > > James > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/intel-gfx