From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754659Ab0IEJiI (ORCPT ); Sun, 5 Sep 2010 05:38:08 -0400 Received: from silver.sucs.swan.ac.uk ([137.44.10.1]:57545 "EHLO silver.sucs.swan.ac.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752231Ab0IEJiG (ORCPT ); Sun, 5 Sep 2010 05:38:06 -0400 Date: Sun, 5 Sep 2010 10:37:59 +0100 From: Sitsofe Wheeler To: Pekka Enberg Cc: Sven Joachim , Hugh Dickins , Chris Wilson , torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, Andrew Morton , Jesse Barnes Subject: Re: [PATCH] Revert "drm/i915: fix vblank wait test condition" Message-ID: <20100905093758.GB23589@sucs.org> References: <1283588234-2514-1-git-send-email-penberg@kernel.org> <89k83a$9hv9li@azsmga001.ch.intel.com> <87vd6ls0jd.fsf@turtle.gmx.de> <20100904224453.GA31664@sucs.org> <4C834DB5.3070702@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4C834DB5.3070702@kernel.org> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Sep 05, 2010 at 10:58:45AM +0300, Pekka Enberg wrote: > > I haven't heard of this problem. Is it reported on LKML? Is it a > regression from 2.6.35? Yes I did report it on the LKML (the initial report is http://lkml.org/lkml/2010/8/23/432 ) but I've being trying to track other reports mentioning similar symptoms too (e.g. I mentioned the previous link to you in http://lkml.org/lkml/2010/8/29/52 ) but it seems like they might different. The Intel guys spent a good while doing investigations and having me try patches which is what led to a half fix ( http://marc.info/?l=linux-kernel&m=128267471015593&w=2 ) but there are still situations which show problems (e.g. after suspend to ram). I've also created a bug on the xorg bugzilla ( http://bugs.freedesktop.org/show_bug.cgi?id=29857 ) which has more debugging information. The problem is there are so many symptoms but worse, the triggers are weird/marginal so it's hard to tell if it has been fixed. Yes it is a regression from 2.6.35 see http://lkml.org/lkml/2010/8/24/132 where I bisected it down to commit 9d0498a2bf7455159b317f19531a3e5db2ecc9c4 . -- Sitsofe | http://sucs.org/~sits/