From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S932412Ab2CVCdd (ORCPT <rfc822;w@1wt.eu>);
	Wed, 21 Mar 2012 22:33:33 -0400
Received: from mail-pz0-f46.google.com ([209.85.210.46]:64087 "EHLO
	mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1757339Ab2CVCdQ (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 21 Mar 2012 22:33:16 -0400
Subject: Re: [PATCH] Added backlight driver for Acer Aspire 4736
From: Pradeep Subrahmanion <subrahmanion.pradeep@gmail.com>
To: joeyli <jlee@suse.com>
Cc: Matthew Garrett <mjg@redhat.com>, rpurdie@rpsys.net,
        FlorianSchandinat@gmx.de, akpm@linux-foundation.org,
        linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
In-Reply-To: <1332380037.10557.398.camel@linux-s257.site>
References: <1331608337.2267.67.camel@debian.Gayathri>
	 <20120312175130.GA18002@srcf.ucam.org>
	 <1331640592.3485.50.camel@debian.Gayathri>
	 <20120313124738.GB10822@srcf.ucam.org>
	 <CABNxG=Dqg26EHmC3vibf3-SjVhby1qgQfMniQObUeh9eJ6SwEw@mail.gmail.com>
	 <20120313133458.GA11574@srcf.ucam.org>
	 <1331688294.2577.19.camel@debian.Gayathri>
	 <1331680373.10557.169.camel@linux-s257.site>
	 <1331692996.3052.8.camel@debian.Gayathri>
	 <1331704278.10557.190.camel@linux-s257.site>
	 <CABNxG=D3y2GQqS1XN=+B0QRScXpufBkPQtP5-SSNEjSavhtW7g@mail.gmail.com>
	 <1331798740.10557.245.camel@linux-s257.site>
	 <1332047432.6304.13.camel@debian.Gayathri>
	 <1332122514.10557.270.camel@linux-s257.site>
	 <1332241764.10557.329.camel@linux-s257.site>
	 <1332269710.3921.31.camel@debian.Gayathri>
	 <1332298845.10557.343.camel@linux-s257.site>
	 <1332356993.3103.23.camel@debian.Gayathri>
	 <1332380037.10557.398.camel@linux-s257.site>
Content-Type: text/plain; charset="UTF-8"
Date: Thu, 22 Mar 2012 08:03:43 +0530
Message-ID: <1332383623.2622.6.camel@debian.Gayathri>
Mime-Version: 1.0
X-Mailer: Evolution 2.30.3
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Thu, 2012-03-22 at 09:33 +0800, joeyli wrote:
> 於 四，2012-03-22 於 00:39 +0530，Pradeep Subrahmanion 提到：
> > > This new patch should remove acpi_video0 interface on your machine.
> > > Please kindly provide your dmidecode:
> > >  dmidecode > dmidecode.log
> > >
> > > And, 
> > > please make should the patch really applied, you can do a bit change on
> > > pr_info message by yourself.
> > 
> >    Sorry . I think there was some mistake . I tried the patch again. Now
> > I see only intel_backlight inside /sys/class/backlight. There is no
> > acer-wmi interface . Is this the expected behavior ? . Or am I missing
> > anything ?
> > 
> 
> Yes, this is the expected behavior! But, now I doubt your issue was
> workaround by acpi_osi=Linux but not intel_backlight.
>

> > 
> > 
> > > 
> > > > echo 5 > /sys/class/backlight/acpi_video0/brightness 
> > > > echo 5 > /sys/class/backlight/intel_backlight/brightness
> > > > 
> > > > But it doesn't make any change . 
> > > > 
> > > > In my case  , 'acpi_backlight = vendor' does not make any difference since the hot key control 
> > > > 
> > > > already starts working with 'acpi_osi=Linux' option.
> > > > 
> > > > cat /proc/cmdline gives , 
> > > > 
> > > > BOOT_IMAGE=/boot/vmlinuz-3.3.0+
> > > > root=UUID=f0197a59-c067-4fd8-ad90-c4d721816077 ro acpi_osi=Linux 
> > > > 
> > > > 
> > > > Thanks , 
> > > > 
> > > > Pradeep Subrahmanion
> > > > 
> > > 
> > > OK, that's more clearly, please remove acpi_osi=Linux then re-test, I
> > > think the hotkey of backlight control only works with acpi_osi=Linux ?
> > > 
> 
> Does your backlight control still work if you remove acpi_osi=Linux ?

   If I remove acpi_osi=Linux , the hot key control stops working .

> 
> 
> Thanks a lot!
> Joey Lee
> 

Thanks , 

Pradeep Subrahmanion