Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423199AbXBUXRP (ORCPT ); Wed, 21 Feb 2007 18:17:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1423248AbXBUXRP (ORCPT ); Wed, 21 Feb 2007 18:17:15 -0500 Received: from out5.smtp.messagingengine.com ([66.111.4.29]:39978 "EHLO out5.smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423199AbXBUXRN (ORCPT ); Wed, 21 Feb 2007 18:17:13 -0500 X-Sasl-enc: F85KINYAGeRoi//Kq4WhdThKxZBxoDPs81YCLSYD1cZH 1172099911 Date: Wed, 21 Feb 2007 21:17:06 -0200 From: Henrique de Moraes Holschuh To: Richard Purdie Cc: Alex Romosan , Yaroslav Halchenko , Andrew Morton , linux-kernel@vger.kernel.org, linux-fbdev-devel@lists.sourceforge.net, James Simmons Subject: Re: no backlight on radeon after recent kernel "upgrade"s Message-ID: <20070221231706.GA3336@khazad-dum.debian.net> References: <20070219044616.GC25659@washoe.onerussian.com> <20070219000412.acad13de.akpm@linux-foundation.org> <1171876788.6046.3.camel@localhost.localdomain> <877iub9mu2.fsf@sycorax.lbl.gov> <1172097718.5790.29.camel@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1172097718.5790.29.camel@localhost.localdomain> X-GPG-Fingerprint: 1024D/1CDB0FE3 5422 5C61 F6B7 06FB 7E04 3738 EE25 DE3F 1CDB 0FE3 User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1026 Lines: 23 On Wed, 21 Feb 2007, Richard Purdie wrote: > enabled. On a thinkpad, the backlight is probably under ACPI control. BIOS+ACPI, actually. Without ACPI video loaded, the firmware does everything correctly. With ACPI video, the firmware does it, then its changes are clobbered over by ACPI video's. If ibm-acpi is loaded, a backlight device "ibm" is added. ibm-acpi's ibm backlight device can change the display brightness. It is *not* capable of turning the backlight on or off, AFAIK. BTW, some ThinkPads don't have a Radeon, but rather an Intel GM/GMX device. -- "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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/