From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756325Ab1AaUja (ORCPT ); Mon, 31 Jan 2011 15:39:30 -0500 Received: from ogre.sisk.pl ([217.79.144.158]:55020 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754042Ab1AaUj2 (ORCPT ); Mon, 31 Jan 2011 15:39:28 -0500 From: "Rafael J. Wysocki" To: Thomas Meyer Subject: Re: 2.6.38-rc2: acpi backlight control missing Date: Mon, 31 Jan 2011 21:39:03 +0100 User-Agent: KMail/1.13.5 (Linux/2.6.38-rc2+; KDE/4.4.4; x86_64; ; ) Cc: rui.zhang@intel.com, Linux Kernel Mailing List , ACPI Devel Mailing List References: <1295693349.2120.3.camel@localhost.localdomain> <201101222043.07703.rjw@sisk.pl> <1296249125.2006.7.camel@localhost.localdomain> In-Reply-To: <1296249125.2006.7.camel@localhost.localdomain> MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <201101312139.03634.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Friday, January 28, 2011, Thomas Meyer wrote: > Am Samstag, den 22.01.2011, 20:43 +0100 schrieb Rafael J. Wysocki: > > On Saturday, January 22, 2011, Thomas Meyer wrote: > > > with 2.6.38-rc2 the acpi backlight is gone: > > > > > > any ideas? > > > > Not really, but Matthew may have some (CCed). > > Okay, found the problem. > > This commit broke my backlight: > > commit 677bd810eedce61edf15452491781ff046b92edc > Author: Zhang Rui > Date: Mon Dec 6 15:04:21 2010 +0800 > > ACPI video: remove output switching control > > This is because in function > "acpi_is_video_device()" (drivers/acpi/video_detect.c) the backlight > device is only checked when some video capabilities were found, but by > removing the check for the VIDEO_OUTPUT_SWITCHING (that seems to be the > only video capability on my system) the check for the backlight device > isn't done anymore. > > by reverting above commit, the backlight is back again. Is it the same issue as https://bugzilla.kernel.org/show_bug.cgi?id=27702 ? In case it is, can you test the patch in there, please? Rafael