From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: Re: [Regression]: Changing brightness does not work with v3.16-rc4 Date: Wed, 16 Jul 2014 02:43:42 +0200 Message-ID: <2231725.PEI454q0UP@vostro.rjw.lan> References: <20140712180636.698e2e4c@saldaea> <53C53543.1050207@redhat.com> <53C53E89.2020505@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7Bit Return-path: Received: from v094114.home.net.pl ([79.96.170.134]:57198 "HELO v094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S932943AbaGPAZ2 (ORCPT ); Tue, 15 Jul 2014 20:25:28 -0400 In-Reply-To: <53C53E89.2020505@intel.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Aaron Lu Cc: Hans de Goede , Julian Wollrath , linux-acpi@vger.kernel.org On Tuesday, July 15, 2014 10:45:29 PM Aaron Lu wrote: > On 07/15/2014 10:05 PM, Hans de Goede wrote: [cut] > > On 07/15/2014 04:00 PM, Aaron Lu wrote: > > > > > If we have to consider the following config: > > > 1 ACPI backlight interface works(or can work with some cmdline option); > > > > And the BIOS advertises native win8 support. > > Right. > So this condition should be: > 1 ACPI backlight interface works in Win8 mode; > > This means, for Julian's system, the commit 751109aad583 doesn't need to > be reverted as the ACPI backlight interface on his system only works > when the acpi_osi="!Windows 2012" is added. In that case, the > video.use_native_backlight=X doesn't make any difference anymore. But Julian reports that he needs to revert that commit to make things work as before for him. What gives? Rafael