From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ike Panhc <ike.pan@canonical.com>
Subject: Re: [PATCH 2/3] ideapad: Add nodes in sysfs
Date: Thu, 02 Jun 2011 18:14:53 +0800
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To: Corentin Chary <corentin.chary@gmail.com>
Cc: platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Matthew Garrett <mjg@redhat.com>, Randy Dunlap <rdunlap@xenotime.net>

On 06/02/2011 05:48 PM, Corentin Chary wrote:
> Hi Ike,
> Why do you want to add /sys/devices/platform/ideapad/brightness and
>     /sys/devices/platform/ideapad/backlight ?
> Both of these files should be handled by the generic backlight class
> (using brightness and bl_power).

This is within VPC2004. In DSDT they are different device from generic
backlight.

and I try bl_power but can not turning off power of whole LCD. No idea
how screensaver do it, looks like just cut off video signal.