From owner-freebsd-current@FreeBSD.ORG Tue Mar 2 11:48:12 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7E4B116A4CE for ; Tue, 2 Mar 2004 11:48:12 -0800 (PST) Received: from root.org (root.org [67.118.192.226]) by mx1.FreeBSD.org (Postfix) with SMTP id 46FA343D2D for ; Tue, 2 Mar 2004 11:48:12 -0800 (PST) (envelope-from nate@root.org) Received: (qmail 12998 invoked by uid 1000); 2 Mar 2004 19:48:13 -0000 Date: Tue, 2 Mar 2004 11:48:13 -0800 (PST) From: Nate Lawson To: "Grover, Andrew" In-Reply-To: Message-ID: <20040302114344.N12977@root.org> References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: acpi-jp@jp.FreeBSD.org cc: current@freebsd.org Subject: RE: [acpi-jp 3093] Re: Update on ACPI with FreeBSD CURRENT on ThinkPad T30 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Mar 2004 19:48:12 -0000 On Tue, 2 Mar 2004, Grover, Andrew wrote: > > From: owner-acpi-jp@jp.FreeBSD.org > > [mailto:owner-acpi-jp@jp.FreeBSD.org] On Behalf Of Randy Bush > > > Try using the sysctls from the new acpi_video module to turn off the > > > backlight, perhaps by turning the brightness way down. > > > > i am on a t40p and have tried a lot of this to no avail. > > My understanding is that actually turning off the backlight is not done > via _BCM. But, I still don't know exactly how it *is* done. _PS3 might > do it, but some people have hinted that this is something that the video > driver is supposed to know how to do. I believe you're correct. On others, the _PSx methods do control backlight. However, for this platform most is done through SMI so I'm not sure. -Nate