From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757543Ab1CRWjM (ORCPT ); Fri, 18 Mar 2011 18:39:12 -0400 Received: from ogre.sisk.pl ([217.79.144.158]:45848 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757239Ab1CRWjJ (ORCPT ); Fri, 18 Mar 2011 18:39:09 -0400 From: "Rafael J. Wysocki" To: Herton Ronaldo Krzesinski Subject: Re: Suspend/resume regression in Toshiba A11 since 2.6.34-rc4 Date: Fri, 18 Mar 2011 23:38:52 +0100 User-Agent: KMail/1.13.6 (Linux/2.6.38+; KDE/4.6.0; x86_64; ; ) Cc: linux-kernel@vger.kernel.org References: <20110318220034.GA10162@herton-IdeaPad-Y430> In-Reply-To: <20110318220034.GA10162@herton-IdeaPad-Y430> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201103182338.52808.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Friday, March 18, 2011, Herton Ronaldo Krzesinski wrote: > This regression is old, but discovered recently. Since 2.6.34-rc4, > a Toshiba Tecra A11 machine resumes without video for the first time. > Here is the strange thing reported, on the first suspend/resume, when > the machine wakes up the video is blank, but the machine is up (just the > screen is black). If you suspend again, on second resume the video comes > back normally. > > Helping the reporter bisecting the problem, we narrowed down the bug to > this commit: > > commit ac7729da880e742613129ee6dea0045328670d2d > Author: Rafael J. Wysocki > Date: Mon Apr 5 01:43:51 2010 +0200 > > ACPI / PM: Move ACPI video resume to a PM notifier > > And reverting this commit on 2.6.38 still made the problem go away. > Looking at the commit above I don't saw any problem, and perhaps we have > some bad bios here which by moving the resume of acpi video later > triggers this bug. Also strange that on second suspend/resume everything > is normal... (the regression here is just the video is blank on first > resume). > > I asked the reporter to try to increase brightness logged in remotely > when the video is blank after first resume, but this didn't have any > effect. > > This was reported in https://bugs.launchpad.net/bugs/719620 (if reading > I recommend to skip to comment #58 and later), I can't think of any > solution besides trying to move acpi video resume perhaps back and > depend on video device being resume first. I asked for more debugging > information but got nothing unfortunately which could diagnose better > this... What graphics driver is used? Rafael