Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754280Ab3IIPix (ORCPT ); Mon, 9 Sep 2013 11:38:53 -0400 Received: from mail-bl2lp0205.outbound.protection.outlook.com ([207.46.163.205]:31286 "EHLO na01-bl2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751761Ab3IIPiv (ORCPT ); Mon, 9 Sep 2013 11:38:51 -0400 From: Matthew Garrett To: Daniel Vetter CC: "Rafael J. Wysocki" , Aaron Lu , "ACPI Devel Mailing List" , Seth Forshee , "Lee, Chun-Yi" , Daniel Vetter , "intel-gfx@lists.freedesktop.org" , "dri-devel@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , Len Brown , Igor Gnatenko , Yves-Alexis Perez , "Felipe Contreras" , Lee Chun-Yi , Henrique de Moraes Holschuh Subject: Re: [PATCH 2/2] ACPI / video / i915: Remove ACPI backlight if firmware expects Windows 8 Thread-Topic: [PATCH 2/2] ACPI / video / i915: Remove ACPI backlight if firmware expects Windows 8 Thread-Index: AQHOrTh4P2SImvKSpUu3tJlbFkAqyJm9JHkAgAAt1ACAADO4AIAABOCA Date: Mon, 9 Sep 2013 15:38:46 +0000 Message-ID: <1378741125.17982.1.camel@x230.lan> References: <522D88C3.7000808@intel.com> <522D89EC.6050103@intel.com> <20130909093209.GF27291@phenom.ffwll.local> <1793135.3qk7NfcINN@vostro.rjw.lan> <20130909152118.GG27291@phenom.ffwll.local> In-Reply-To: <20130909152118.GG27291@phenom.ffwll.local> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [2001:470:1f07:1371:5d52:9ee3:3e84:6668] x-forefront-prvs: 09645BAC66 x-forefront-antispam-report: SFV:NSPM;SFS:(199002)(189002)(24454002)(377424004)(77096001)(63696002)(56816003)(74876001)(83072001)(76482001)(74706001)(74502001)(53806001)(47446002)(31966008)(74662001)(80976001)(54356001)(19580395003)(80022001)(83322001)(19580405001)(56776001)(54316002)(65816001)(51856001)(59766001)(77982001)(74366001)(69226001)(79102001)(46102001)(81816001)(33646001)(81686001)(49866001)(36756003)(81342001)(76796001)(76786001)(81542001)(47976001)(50986001)(4396001)(47736001)(3826001);DIR:OUT;SFP:;SCL:1;SRVR:BY2PR05MB221;H:BY2PR05MB222.namprd05.prod.outlook.com;CLIP:2001:470:1f07:1371:5d52:9ee3:3e84:6668;RD:InfoNoRecords;A:1;MX:1;LANG:en; Content-Type: text/plain; charset="utf-8" Content-ID: <23D000ECEB941D4EA80ED8426F386A9F@namprd05.prod.outlook.com> MIME-Version: 1.0 X-OriginatorOrg: nebula.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id r89Fcw0j020857 Content-Length: 919 Lines: 17 On Mon, 2013-09-09 at 17:21 +0200, Daniel Vetter wrote: > If Win8 is as broken as we are I'm ok with the module option. It just > sounded to me like right now we don't know of a way to make all machines > somewhat happy, combined with the other pile of random backlight issues > the assumption that we do something (maybe something a bit racy) that > windows doesn't do isn't too far-fetched. So I'm not wary of the machines > where the aml is busted for acpi_os=win8, but for the others where this > broke stuff. Windows 8 isn't broken because (as far as we can tell) the Intel drivers under Windows 8 never use the ACPI backlight set function. Of course, it would be nice to have that confirmed by Intel. -- Matthew Garrett ????{.n?+???????+%?????ݶ??w??{.n?+????{??G?????{ay?ʇڙ?,j??f???h?????????z_??(?階?ݢj"???m??????G????????????&???~???iO???z??v?^?m???? ????????I?