From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhang Rui Subject: Re: ACPI error messages Date: Mon, 07 Jun 2010 09:12:20 +0800 Message-ID: <1275873140.19052.9516.camel@rzhang1-desktop> References: Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from mga09.intel.com ([134.134.136.24]:35437 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751639Ab0FGBLz (ORCPT ); Sun, 6 Jun 2010 21:11:55 -0400 In-Reply-To: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Alan Stern Cc: Matthew Garrett , "linux-acpi@vger.kernel.org" On Fri, 2010-06-04 at 22:52 +0800, Alan Stern wrote: > On Fri, 4 Jun 2010, Zhang Rui wrote: > > > I've heard that win7 prefers the ACPI wmi driver instead of ACPI video > > driver for backlight control. But not sure if win7 prefers the platform > > driver as well. > > > > Alan, > > can you help me verify if the backlight control works well when you boot > > w/ acpi_backlight=vendor and w/o acpi_osi="!Windwos 2009"? > > I don't have the laptop with me here, so this will have to wait a > little. > okay. > Also, I've never used the backlight control and I don't know how it > works. What should I do in order to test it? > You can change the backlight by poking /sys/class/backlight/*/brightness thanks, rui