From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mathieu Magnaudet Subject: backlight issue with an Acer Iconia Dual Screen Date: Tue, 22 Nov 2011 14:43:22 +0100 Message-ID: <4ECBA6FA.6060208@enac.fr> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from smtp.lii-enac.fr (88-230.252-81.static-ip.oleane.fr [81.252.230.88]) by gabe.freedesktop.org (Postfix) with ESMTP id CCBEA9E778 for ; Tue, 22 Nov 2011 05:51:26 -0800 (PST) Received: from ptitard.local (unknown [10.0.0.109]) by smtp.lii-enac.fr (DoorWays) with ESMTP id 38F359516F for ; Tue, 22 Nov 2011 14:43:23 +0100 (CET) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org Hi all I am trying to install a fedora 16 on an Acer Iconia, a laptop with a double touch screen. Thanks to a recent patch in the Intel graphics driver, the second touch screen is now well recognized. However the backlight is set to the minimal value and there is no way to control it (only the backlight of the first screen can be changed). The log suggests that two control interfaces for backlight are found: [ 30.752] (II) intel(0): Output LVDS1 has no monitor section [ 30.758] (II) intel(0): found backlight control interface /sys/class/backlight/acpi_video0 [ 30.758] (II) intel(0): Output VGA1 has no monitor section [ 30.851] (II) intel(0): Output LVDS2 has no monitor section [ 30.856] (II) intel(0): found backlight control interface /sys/class/backlight/acpi_video0 In the /sys/class/backlight directory there is an acpi_video0 directory that seems rightly initialized and there is also an intel_backlight directory but with a max_brightness set to 1. Do you think that the problem comes from the driver? Thanks a lot Mathieu -- Mathieu Magnaudet - Chercheur Laboratoire d'Informatique Interactive ENAC - 7 av Edouard Belin 31055 TOULOUSE CEDEX 4 (phone) +33 562 174 217