From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753171AbcIST1V (ORCPT ); Mon, 19 Sep 2016 15:27:21 -0400 Received: from bedivere.hansenpartnership.com ([66.63.167.143]:50556 "EHLO bedivere.hansenpartnership.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752835AbcIST1T (ORCPT ); Mon, 19 Sep 2016 15:27:19 -0400 Message-ID: <1474313230.2398.30.camel@HansenPartnership.com> Subject: Re: [Intel-gfx] Skylake graphics regression: projector failure with 4.8-rc3 From: James Bottomley To: Thorsten Leemhuis , "Zanoni, Paulo R" , "dri-devel@lists.freedesktop.org" , "intel-gfx@lists.freedesktop.org" Cc: "linux-kernel@vger.kernel.org" Date: Mon, 19 Sep 2016 12:27:10 -0700 In-Reply-To: <1474297777.2426.9.camel@HansenPartnership.com> 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> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.16.5 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. James