From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753508AbcITIOr (ORCPT ); Tue, 20 Sep 2016 04:14:47 -0400 Received: from mga01.intel.com ([192.55.52.88]:54198 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752159AbcITIOn (ORCPT ); Tue, 20 Sep 2016 04:14:43 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.30,366,1470726000"; d="scan'208";a="1059378738" From: Jani Nikula To: James Bottomley , Thorsten Leemhuis , "Zanoni\, Paulo R" , "dri-devel\@lists.freedesktop.org" , "intel-gfx\@lists.freedesktop.org" Cc: "linux-kernel\@vger.kernel.org" Subject: Re: [Intel-gfx] Skylake graphics regression: projector failure with 4.8-rc3 In-Reply-To: <1474313230.2398.30.camel@HansenPartnership.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <1472217035.5189.50.camel@HansenPartnership.com> <1472667806.2316.42.camel@HansenPartnership.com> <1472679836.2316.65.camel@HansenPartnership.com> <1472680290.2387.219.camel@intel.com> <1472682357.2280.3.camel@HansenPartnership.com> <1474297777.2426.9.camel@HansenPartnership.com> <1474313230.2398.30.camel@HansenPartnership.com> User-Agent: Notmuch/0.22.1+63~g648dcc7 (https://notmuchmail.org) Emacs/24.4.1 (x86_64-pc-linux-gnu) Date: Tue, 20 Sep 2016 11:14:39 +0300 Message-ID: <87oa3jm1hs.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 19 Sep 2016, James Bottomley wrote: > On Mon, 2016-09-19 at 08:09 -0700, James Bottomley wrote: >> On Sun, 2016-09-18 at 13:35 +0200, Thorsten Leemhuis wrote: >> > Hi! James & Paulo: What's the current status of this? >> >> No, the only interaction has been the suggestion below for a revert, >> which didn't fix the problem. >> >> > Was this issue discussed elsewhere or even fixed in between? Just >> > asking, because this issue is on the list of regressions for 4.8. >> >> >> I'm just about to try out -rc7, but it's not fixed so far. > > OK, with -rc7 and the i915 fixes, there seems to be a marked > improvement. I can no longer crash the crtc by using lots of xrandr > switches, which was the principal problem. > > I've so far only got one of these in the logs > > [14858.635035] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* > CPU pipe B FIFO underrun > > And the only residual problem seems to be that the monitor goes blank > periodically, but this can be fixed by switching resolution a couple of > times. > > I haven't seen any of the link training errors so far and I've run > through my usual battery of be nasty to the external monitor tests. Thanks for the update. We still have fixes for the underruns in the pipeline. BR, Jani. -- Jani Nikula, Intel Open Source Technology Center