From owner-freebsd-questions@FreeBSD.ORG  Thu May 21 12:01:26 2015
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id B31DC2B4
 for <freebsd-questions@freebsd.org>; Thu, 21 May 2015 12:01:26 +0000 (UTC)
Received: from mx01.qsc.de (mx01.qsc.de [213.148.129.14])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 748DE117D
 for <freebsd-questions@freebsd.org>; Thu, 21 May 2015 12:01:26 +0000 (UTC)
Received: from r56.edvax.de (port-92-195-181-19.dynamic.qsc.de [92.195.181.19])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by mx01.qsc.de (Postfix) with ESMTPS id 516693CE69;
 Thu, 21 May 2015 14:01:24 +0200 (CEST)
Received: from r56.edvax.de (localhost [127.0.0.1])
 by r56.edvax.de (8.14.5/8.14.5) with SMTP id t4LC1N2T003169;
 Thu, 21 May 2015 14:01:23 +0200 (CEST)
 (envelope-from freebsd@edvax.de)
Date: Thu, 21 May 2015 14:01:23 +0200
From: Polytropon <freebsd@edvax.de>
To: Avinash Sonawane <rootkea@gmail.com>
Cc: FreeBSD Questions <freebsd-questions@freebsd.org>
Subject: Re: Brightness control in FreeBSD 10.1-RELEASE
Message-Id: <20150521140123.a18aadc2.freebsd@edvax.de>
In-Reply-To: <CAJ9BSW_Pf5BkL2TJfChy69k9ndCq_4Vku=ExTFFa5RbeWjHbkg@mail.gmail.com>
References: <CAJ9BSW-w6YvA71zu=zV2e_r4Lg78tCPahCc2_6CBkEDdmairFw@mail.gmail.com>
 <CAJ-VmomybDZX54aP1UWCZvw-H-JUmbbTaocmg4X_kHw7-E1mzg@mail.gmail.com>
 <CAJ9BSW_Pf5BkL2TJfChy69k9ndCq_4Vku=ExTFFa5RbeWjHbkg@mail.gmail.com>
Reply-To: Polytropon <freebsd@edvax.de>
Organization: EDVAX
X-Mailer: Sylpheed 3.1.1 (GTK+ 2.24.5; i386-portbld-freebsd8.2)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 21 May 2015 12:01:26 -0000

On Thu, 21 May 2015 17:17:45 +0530, Avinash Sonawane wrote:
> Another observation:
> I can change the brightness (increase/decrease) while FreeBSD is
> booting so it looks like FreeBSD does properly loads the driver
> controlling the brightness change. (?)

Is this really a thing of "driver"? Yes, I know: "Modern" laptops
use software to "connect" the keys to the brightness, whereas old
laptops did that "in hardware" somehow - independent from the OS,
even working in BIOS or during bluescreens.

I could imagine that somehow, when the OS and the GUI is loaded,
the keys designed to adjust brightness emit a "normal" key code
that the GUI (here: X's keyboard input machanism) picks up and
does something stupid with it. You can easily check for that
possibility: install the "xev" (X event viewer) port and press
those keys. Look for "KeyPress" entries. What happens?


-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...