From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aaron Lu Subject: Re: [Regression]: Changing brightness does not work with v3.16-rc4 Date: Mon, 14 Jul 2014 10:06:21 +0800 Message-ID: <53C33B1D.4070500@intel.com> References: <20140712180636.698e2e4c@saldaea> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from mga11.intel.com ([192.55.52.93]:57261 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752194AbaGNCGe (ORCPT ); Sun, 13 Jul 2014 22:06:34 -0400 In-Reply-To: <20140712180636.698e2e4c@saldaea> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Julian Wollrath , linux-acpi@vger.kernel.org On 07/13/2014 12:06 AM, 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. Does your system have /sys/class/backlight/intel_backlight? Does it work if you manually change the brightness file like this: # cd /sys/class/backlight/intel_backlight # cat max_brightness xxxxx # echo xxx > brightness # echo xxx > brightness ... Thanks, Aaron > > > With best regards, > Julian Wollrath > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >