From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751056AbXCBVkI (ORCPT ); Fri, 2 Mar 2007 16:40:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751065AbXCBVkI (ORCPT ); Fri, 2 Mar 2007 16:40:08 -0500 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:54966 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751067AbXCBVkG (ORCPT ); Fri, 2 Mar 2007 16:40:06 -0500 Date: Fri, 02 Mar 2007 13:40:05 -0800 (PST) Message-Id: <20070302.134005.55727374.davem@davemloft.net> To: romosan@sycorax.lbl.gov Cc: hmh@hmh.eng.br, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-fbdev-devel@lists.sourceforge.net, rpurdie@rpsys.net Subject: Re: 2.6.21-rc2 radeon backlight From: David Miller In-Reply-To: <87mz2v5oj0.fsf@sycorax.lbl.gov> References: <20070302.123514.35465791.davem@davemloft.net> <20070302210157.GA11786@khazad-dum.debian.net> <87mz2v5oj0.fsf@sycorax.lbl.gov> X-Mailer: Mew version 5.1.52 on Emacs 21.4 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org From: Alex Romosan Date: Fri, 02 Mar 2007 13:22:27 -0800 > if i don't enable the radeon backlight support the backlight works and > i can turn it on and off using radeontool. if i enable the radeon > backlight support the screen stays dark (although i can log on my > laptop remotely). if i try to use radeontool to turn the backlight on > nothing happens. so, at least on the thinkpad, the radeon backlight > support disables some other kind of backlight support that works > otherwise. Right, that's the crux of the problem. The Radeon backlight support conflicts somehow with the way the ACPI code programs the same hardware, and until we figure out exactly what's going on, this is a regression.