Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753847AbbGAIZd (ORCPT ); Wed, 1 Jul 2015 04:25:33 -0400 Received: from mail-wg0-f53.google.com ([74.125.82.53]:32786 "EHLO mail-wg0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753529AbbGAIYV (ORCPT ); Wed, 1 Jul 2015 04:24:21 -0400 Date: Wed, 1 Jul 2015 10:26:39 +0200 From: Daniel Vetter To: Michal Hocko Cc: Daniel Vetter , David Airlie , dri-devel@lists.freedesktop.org, LKML Subject: Re: WARNING: CPU: 0 PID: 3634 at drivers/gpu/drm/drm_irq.c:1141 drm_wait_one_vblank Message-ID: <20150701082639.GE30960@phenom.ffwll.local> Mail-Followup-To: Michal Hocko , David Airlie , dri-devel@lists.freedesktop.org, LKML References: <20150630115707.GA4578@dhcp22.suse.cz> <20150630143249.GA30960@phenom.ffwll.local> <20150630160743.GA4590@dhcp22.suse.cz> <20150630165929.GB30960@phenom.ffwll.local> <20150630201335.GA4496@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150630201335.GA4496@dhcp22.suse.cz> X-Operating-System: Linux phenom 4.0.0-rc3+ User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1244 Lines: 31 On Tue, Jun 30, 2015 at 10:13:35PM +0200, Michal Hocko wrote: > On Tue 30-06-15 18:59:29, Daniel Vetter wrote: > [...] > > I looked at dmesg, nothing out of the ordinary there. Unfortunately also > > no hints why the pipe is somehow off when we think it's on. Can you please > > test the below patch and grab a new dmesg? > > Attached. I'm still baffled - looking at the code intel_crtc->active should be set, but somehow the real hw pipe is dead. Or at least we don't get a vblank irq for it somehow. Confusing. > > Also it might be time to start bisecting this if you can readily reproduce it. > > Yes, I can reproduce it just by switching to the text console. Sometimes > it is the first attempt already but sometimes it takes several attempts. > I will try to go back to 4.0 and bisect it then. Yes please do, since this is a confusing regression I think the bisect result will be the fastest way forward. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch -- 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/