From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755407Ab1CSPfk (ORCPT ); Sat, 19 Mar 2011 11:35:40 -0400 Received: from adelie.canonical.com ([91.189.90.139]:39701 "EHLO adelie.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754238Ab1CSPfj (ORCPT ); Sat, 19 Mar 2011 11:35:39 -0400 Date: Sat, 19 Mar 2011 12:35:34 -0300 From: Herton Ronaldo Krzesinski To: "Rafael J. Wysocki" Cc: linux-kernel@vger.kernel.org Subject: Re: Suspend/resume regression in Toshiba A11 since 2.6.34-rc4 Message-ID: <20110319153533.GA2457@herton-P35C-DS3R> References: <20110318220034.GA10162@herton-IdeaPad-Y430> <201103182338.52808.rjw@sisk.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <201103182338.52808.rjw@sisk.pl> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 18, 2011 at 11:38:52PM +0100, Rafael J. Wysocki wrote: > 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? i915 > > Rafael > -- []'s Herton