From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Clifton Subject: RE: i810, mergedfb and lid switch and acpi video Date: Wed, 17 Jan 2007 14:23:39 +0000 Message-ID: <1169043819.6273.10.camel@localhost> References: <1C601A6A3344064EB423D0C1E83B717BE6FD77@pdsmsx411.ccr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from ppsw-9.csi.cam.ac.uk ([131.111.8.139]:34178 "EHLO ppsw-9.csi.cam.ac.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932330AbXAQOXt (ORCPT ); Wed, 17 Jan 2007 09:23:49 -0500 In-Reply-To: <1C601A6A3344064EB423D0C1E83B717BE6FD77@pdsmsx411.ccr.corp.intel.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: emisca Cc: xorg@lists.freedesktop.org, linux-acpi@vger.kernel.org SORRY - sent back to Luming by mistake - meant to send to all. On Wed, 2007-01-17 at 12:20 +0800, Yu, Luming wrote: > But there is NO _BQC. Instead of _BQC, there do have a _BCQ in DSDT. > Is this a bug of BIOS? Acpi video drvier needs _BQC to get the > current brightness level, and to get the next level to set on receiving > notification of 0x86 (Increase Brightness) , 0x87 (decrease Brightness). I can ACK that my HP had a similar typo / feature with its intel based video: 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller (rev 03) The _BQC is absent, but a strange _BCQ is there - which looks to give the correct functionality. The ONLY place I can find any reference to _BCQ is in a couple of Windows Vista design documents about making display brightness work with Vista. Thank you Microsoft, for that typo - presuming thats what it is! Peter Clifton