linux-kernel - Re: [PATCH] Platform: samsung-laptop: add DMI information for Samsung N150 Plus

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Message-ID: <20120104205128.GB22414@thinkpad-t410>
Date:	Wed, 4 Jan 2012 14:51:28 -0600
From:	Seth Forshee <seth.forshee@...onical.com>
To:	Corentin Chary <corentin.chary@...il.com>
Cc:	Richard Schütz <r.schtz@...nline.de>,
	David Herrmann <dh.herrmann@...glemail.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Andrzej Prochyra <andrzej@...chyra.name>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Zhang, Rui" <rui.zhang@...el.com>
Subject: Re: [PATCH] Platform: samsung-laptop: add DMI information for
 Samsung N150 Plus

On Thu, Dec 29, 2011 at 12:49:41PM +0100, Corentin Chary wrote:
> And that's ? Because new laptops that use SABI seems to have a working
> acpi_video0.
> Currently, N1{4,5}* seems to be affected.

You can add the NF310 to the list of machines without a working
acpi_video0. The disassembled DSDT is attached, and the backlight
control methods are a bit puzzling. _BCM seems to only accept values
that are multiples of 10, but _BCL returns several values that do not
meet this criterion. However, when _BCM is called with any of the values
from _BCL, even the ones that aren't multiples of 10, _BQC returns the
corresponding value. I must be missing something.

At any rate, no matter the value given to _BCM the brightness does not
change.

View attachment "DSDT.dsl" of type "text/plain" (203914 bytes)