From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Barattini Subject: Re: Date: Mon, 23 Dec 2013 17:24:40 +0100 Message-ID: References: <52B79590.5030405@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Return-path: Received: from mail-oa0-f49.google.com ([209.85.219.49]:58161 "EHLO mail-oa0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757625Ab3LWQYm (ORCPT ); Mon, 23 Dec 2013 11:24:42 -0500 Received: by mail-oa0-f49.google.com with SMTP id i4so5736179oah.8 for ; Mon, 23 Dec 2013 08:24:41 -0800 (PST) In-Reply-To: <52B79590.5030405@intel.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Aaron Lu Cc: linux-acpi@vger.kernel.org At the moment, set acpi_backlight=vendor on GRUB as a workaround, works only with kernel version 3.11.0-14-generic (Ubuntu stable kernel). Set the workaround in the Kernel v3.13-rc5 produce blackscreen at startup. You can see the update and the evolution of the bug here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1261853 2013/12/23 Aaron Lu : > On 12/22/2013 12:48 AM, Alex Barattini wrote: >> [1.] One line summary of the problem: >> >> 8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight >> >> [2.] Full description of the problem/report: >> >> The change in the level of illumination of the screen, through the >> corresponding option in the control panel, has no effect. > > Does this patch help? > http://www.spinics.net/lists/linux-acpi/msg47755.html >