Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751421Ab3GXK5E (ORCPT ); Wed, 24 Jul 2013 06:57:04 -0400 Received: from mail-ob0-f171.google.com ([209.85.214.171]:46716 "EHLO mail-ob0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751149Ab3GXK5C convert rfc822-to-8bit (ORCPT ); Wed, 24 Jul 2013 06:57:02 -0400 MIME-Version: 1.0 In-Reply-To: <51EF773F.40903@gmail.com> References: <51EF773F.40903@gmail.com> Date: Wed, 24 Jul 2013 12:57:01 +0200 Message-ID: Subject: Re: [v3.11-rc2] regression: brightness always on maximum. From: =?UTF-8?Q?J=C3=B6rg_Otte?= To: Aaron Lu Cc: Linux Kernel Mailing List , rafael.j.wysocki@intel.com, Linus Torvalds Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1132 Lines: 39 2013/7/24 Aaron Lu : > On 07/23/2013 03:52 PM, Jörg Otte wrote: >> The brightness of my laptop is always on maximum and can't be scaled >> down. >> Brightness control via function keys was always working on this >> laptop, so this is a regression in v3.11-rc2. > > Please list /sys/class/backlight. # cd /sys/class # find backlight -name "*" backlight backlight/intel_backlight # cd backlight/intel_backlight # ls actual_brightness bl_power brightness device max_brightness power subsystem type uevent # cat actual_brightness 0 # cat max_brightness 4882 actual_brightness is 0, but brightness is on maximum! > > If there is a intel_backlight, please try to adjust brightness level > through brightness file like this: > # echo XXX > /sys/class/backlight/intel_backlight/brightness > Does it work? no, it doesn't have any visible effect. Thanks, Jörg -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/