linux-kernel - Re: [PATCH 2/3] ideapad: Add nodes in sysfs

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Message-ID: <BANLkTinEu20oGdX+9LwM7fswzgZaVkuf3yEfip-p9gTkUTzu5g@mail.gmail.com>
Date:	Thu, 2 Jun 2011 13:22:54 +0200
From:	Corentin Chary <corentin.chary@...il.com>
To:	Ike Panhc <ike.pan@...onical.com>
Cc:	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, Matthew Garrett <mjg@...hat.com>,
	Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH 2/3] ideapad: Add nodes in sysfs

On Thu, Jun 2, 2011 at 12:14 PM, Ike Panhc <ike.pan@...onical.com> wrote:
> 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.

What I wanted to say is that you should use the generic backlight
class (!=driver) to expose these. You can look at asus-wmi.c to see
how it's done.
Then users will be able to choose the backlight implementation using
acpi_backlight=vendor or acpi_backlight=video.

-- 
Corentin Chary
http://xf.iksaif.net
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