Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753482Ab3IJOTn (ORCPT ); Tue, 10 Sep 2013 10:19:43 -0400 Received: from mga09.intel.com ([134.134.136.24]:59240 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751960Ab3IJOTk convert rfc822-to-8bit (ORCPT ); Tue, 10 Sep 2013 10:19:40 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.90,878,1371106800"; d="scan'208";a="393614301" From: Jani Nikula To: Matthew Garrett Cc: "Rafael J. Wysocki" , Daniel Vetter , Aaron Lu , ACPI Devel Mailing List , Daniel Vetter , "intel-gfx\@lists.freedesktop.org" , Yves-Alexis Perez , "linux-kernel\@vger.kernel.org" , "dri-devel\@lists.freedesktop.org" , Seth Forshee , "Lee\, Chun-Yi" , Igor Gnatenko , Henrique de Moraes Holschuh , Lee Chun-Yi , Len Brown Subject: Re: [PATCH 2/2] ACPI / video / i915: Remove ACPI backlight if firmware expects Windows 8 In-Reply-To: <1378821416.17982.56.camel@x230.lan> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <522D88C3.7000808@intel.com> <1793135.3qk7NfcINN@vostro.rjw.lan> <20130909152118.GG27291@phenom.ffwll.local> <5155010.Y1gov7SKhP@vostro.rjw.lan> <87eh8wail7.fsf@intel.com> <1378821416.17982.56.camel@x230.lan> User-Agent: Notmuch/0.16+63~g12e17e8 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) Date: Tue, 10 Sep 2013 17:21:41 +0300 Message-ID: <87bo40ahai.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1248 Lines: 33 On Tue, 10 Sep 2013, Matthew Garrett wrote: > On Tue, 2013-09-10 at 16:53 +0300, Jani Nikula wrote: > >> I think the parameter "Does the ACPI backlight interface work or not" >> belongs to the ACPI video driver. > > That depends on how Windows 8 works. If Windows 8 policy is handled by > the GPU drivers then it belongs in i915. If it's handled by the ACPI > code then it belongs in the ACPI code. I fail to see the logic. Windows 8 policy dictates whether we can use the AML code or not. IMHO, ACPI code is in the best position to figure this out and quirk as necessary. It's the part that knows about Windows 8, not i915. > But I have no way of determining that, whereas you work for a company > that produces a Windows 8 video driver… Here I do see the logic. However see signature; I'm not in the best of positions to figure out things about Windows 8 video drivers. ;) But I'll see what I can do. BR, Jani. -- Jani Nikula, Intel Open Source Technology Center -- 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/