From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758675AbYBBLa2 (ORCPT ); Sat, 2 Feb 2008 06:30:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754342AbYBBLaR (ORCPT ); Sat, 2 Feb 2008 06:30:17 -0500 Received: from out2.smtp.messagingengine.com ([66.111.4.26]:52985 "EHLO out2.smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754040AbYBBLaP (ORCPT ); Sat, 2 Feb 2008 06:30:15 -0500 X-Sasl-enc: oGNzpTVo9F30nyKQJfEXmNSVhFbhskCvCdImWK+OvfmQ 1201951813 Date: Sat, 2 Feb 2008 09:30:08 -0200 From: Henrique de Moraes Holschuh To: Len Brown Cc: Andrew Morton , Matthew Garrett , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Subject: Re: [PATCH] Rationalise ACPI backlight implementation Message-ID: <20080202113008.GA4251@khazad-dum.debian.net> References: <20071226020325.GA21099@srcf.ucam.org> <20080128012549.GA24166@srcf.ucam.org> <20080127211013.1ddaa6a1.akpm@linux-foundation.org> <200802012246.13162.lenb@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200802012246.13162.lenb@kernel.org> X-GPG-Fingerprint: 1024D/1CDB0FE3 5422 5C61 F6B7 06FB 7E04 3738 EE25 DE3F 1CDB 0FE3 User-Agent: Mutt/1.5.17+20080114 (2008-01-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 01 Feb 2008, Len Brown wrote: > You might check if CONFIG_ACPI_VIDEO=m is set and you can load the "video" module. > While the sony may be non-standard and not load, your thinkpad may work. It will work except under new X.org, which disables BIOS backlight functionality in order to do it directly, at least on Intel GPUs (and probably also on ATI GPUs. nVidia is no-man's-land). And I have been told that X.org can do 256 backlight levels on Intel hardware *including* switching the backlight off, instead of just the 16 levels Lenovo chose to export through ACPI. Looks like someone should add a kernel framebuffer device for those Intels :) We really need to solve the userspace mess, though. -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh