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: Mon, 14 Jul 2014 20:21:19 +0200 Message-ID: <100384914.3msa0DXJgJ@vostro.rjw.lan> References: <20140712180636.698e2e4c@saldaea> <20140712182452.19ef6a91@saldaea> 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]:64736 "HELO v094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751602AbaGNSDF (ORCPT ); Mon, 14 Jul 2014 14:03:05 -0400 In-Reply-To: <20140712182452.19ef6a91@saldaea> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Julian Wollrath Cc: linux-acpi@vger.kernel.org, Aaron Lu On Saturday, July 12, 2014 06:24:52 PM Julian Wollrath wrote: > Hi, > > > changing the brightness on my Thinkpad X230 with Intel HD4000 > > graphics, stopped working after commit 886129a8eebe (ACPI / video: > > change acpi-video brightness_switch_enabled default to 0). Changing > > it back to 1, fixes the problem, if "acpi_osi=!Windows 2012" is also > > set. Before that commit just setting "acpi_osi=!Windows 2012" was > > enough to get changing the brightness working. > > small correction: It setting "acpi_osi=!Windows 2012" does only help > when using a kernel with commit 886129a8eebe as HEAD, with v3.16-rc4 > setting video.brightness_switch_enabled=1 and acpi_osi=!Windows 2012 or > just one of them, does not make changing the brightness work again. And reverting commit 751109aad583 (ACPI / video: Change the default for video.use_native_backlight to 1) make that last problem go away, right? We are going to rever commit 886129a8eebe for other reasons, so can you please revert it from 3.16-rc5 on your system and report back? Rafael