From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754047Ab2F2C5c (ORCPT ); Thu, 28 Jun 2012 22:57:32 -0400 Received: from cavan.codon.org.uk ([93.93.128.6]:52577 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752354Ab2F2C5b (ORCPT ); Thu, 28 Jun 2012 22:57:31 -0400 Date: Fri, 29 Jun 2012 03:57:24 +0100 From: Matthew Garrett To: joeyli Cc: seth.forshee@canonical.com, Richard Purdie , linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, Corentin Chary Subject: Re: [PATCH] backlight: add support for disabling backlights via sysfs Message-ID: <20120629025724.GB18605@srcf.ucam.org> References: <1340910426-13269-1-git-send-email-seth.forshee@canonical.com> <20120628191043.GA9777@srcf.ucam.org> <20120628193017.GA29456@thinkpad-t410> <20120628193652.GB10945@srcf.ucam.org> <20120628211600.GB29456@thinkpad-t410> <20120628211936.GA14286@srcf.ucam.org> <1340937839.6196.212.camel@linux-s257.site> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1340937839.6196.212.camel@linux-s257.site> 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 On Fri, Jun 29, 2012 at 10:43:59AM +0800, joeyli wrote: > http://msdn.microsoft.com/en-us/windows/hardware/gg487382.aspx > > In WDDM architecture, in spec p.5, there have a "Monitor" driver to > check the WDDM driver support brightness DDI, if not, then it will use > standard acpi method to control brightness. What's the interaction between GPU drivers and platform drivers? For instance, on acer systems that have backlight control via WMI, does Windows use WMI, the GPU driver or ACPI? -- Matthew Garrett | mjg59@srcf.ucam.org