From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751875Ab2ACWUA (ORCPT ); Tue, 3 Jan 2012 17:20:00 -0500 Received: from cavan.codon.org.uk ([93.93.128.6]:35963 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751303Ab2ACWT6 (ORCPT ); Tue, 3 Jan 2012 17:19:58 -0500 Date: Tue, 3 Jan 2012 22:19:54 +0000 From: Matthew Garrett To: Keith Packard Cc: linux-kernel@vger.kernel.org, Bdale Garbee Subject: Re: [PATCH] acpi/video: Don't restore backlight to 0 at boot time Message-ID: <20120103221954.GA2313@srcf.ucam.org> References: <1325321547-20637-1-git-send-email-keithp@keithp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1325321547-20637-1-git-send-email-keithp@keithp.com> User-Agent: Mutt/1.5.20 (2009-06-14) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: mjg59@cavan.codon.org.uk X-SA-Exim-Scanned: No (on cavan.codon.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ACPI arguably does define 0 as being off (this is exceedingly poorly defined), but I'm not entirely happy with this - the firmware makes its behaviour conditional on the OS version. I'd really like to see an updated version of the Intel opregion spec to get a better idea of what we're meant to be doing here, but the last one made public was ancient. -- Matthew Garrett | mjg59@srcf.ucam.org