Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752774AbaBLCcU (ORCPT ); Tue, 11 Feb 2014 21:32:20 -0500 Received: from mga11.intel.com ([192.55.52.93]:28680 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751933AbaBLCcS (ORCPT ); Tue, 11 Feb 2014 21:32:18 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.95,829,1384329600"; d="scan'208";a="479994190" Message-ID: <52FADD1F.90209@intel.com> Date: Wed, 12 Feb 2014 10:31:59 +0800 From: Aaron Lu MIME-Version: 1.0 To: Mika Westerberg CC: linux-acpi@vger.kernel.org, "Rafael J. Wysocki" , Len Brown , linux-kernel@vger.kernel.org Subject: Re: [PATCH] ACPI / video: Add HP EliteBook Revolve 810 to the blacklist References: <1391425156-27821-1-git-send-email-mika.westerberg@linux.intel.com> <52F43716.7020008@intel.com> <20140207102523.GO18029@intel.com> In-Reply-To: <20140207102523.GO18029@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 02/07/2014 06:25 PM, Mika Westerberg wrote: > On Fri, Feb 07, 2014 at 09:29:58AM +0800, Aaron Lu wrote: >> On 02/03/2014 06:59 PM, Mika Westerberg wrote: >>> On HP EliteBook Revolve 810 the ACPI backlight device doesn't work as >>> expected. For example when resuming from system sleep, it seems to lose >>> backlight settings. >>> >>> Forcing Intel driver fixes the problem so add this machine the ACPI >>> video detect blacklist. >> >> For reference's purpose, can you please file a bug to kernel bugzilla >> under the ACPI/Power-Video category and attach the acpidump and dmesg >> there? Thanks. > > Done, the bug is here: > > https://bugzilla.kernel.org/show_bug.cgi?id=70231 > > I noticed that using only the acpi_video0 for tuning backlight works but if > I use intel_backlight directly, on resume I get values from acpi_video0 > instead. I'm not really familiar how this is supposed to work, though so > please let me know if I'm missing something. Thanks for the report, as communicated on the bug page, your system is already blacklisted for win8 by commit: commit 2d4054d8422462cb2771fdb4eb1925df55d2b320 Author: Takashi Iwai Fri Dec 20 00:09:12 2013 Committer: Rafael J. Wysocki Fri Dec 20 22:50:56 2013 ACPI: Blacklist Win8 OSI for some HP laptop 2013 models And the fact that acpi_video interface works made it not appropriate to add your system into the video_detect_dmi_table. You can just use acpi_video interface and everything should work fine. -- 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/