linux-kernel - Re: [PATCH 2.6.18-mm2] acpi: add backlight support to the sony

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Message-ID: <20061006211751.GA31887@lists.us.dell.com>
Date:	Fri, 6 Oct 2006 16:17:51 -0500
From:	Matt Domsch <Matt_Domsch@...l.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Andrew Morton <akpm@...l.org>,
	Alessandro Guido <alessandro.guido@...il.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	len.brown@...el.com, jengelh@...ux01.gwdg.de, gelma@...ma.net,
	ismail@...dus.org.tr
Subject: Re: [PATCH 2.6.18-mm2] acpi: add backlight support to the sony_acpi driver

On Thu, Oct 05, 2006 at 10:36:57AM +0000, Pavel Machek wrote:
> Hi!
> 
> > > I assume that cute userspace applications for controlling backlight
> > > brightness via the generic backlight driver either exist or are in
> > > progress?  What is the status of that?
> > 
> > For Dell laptops, the dellLcdBrightness app is included in the
> > libsmbios-bin package (http://linux.dell.com/libsmbios/main/ and
> > http://linux.dell.com/libsmbios/main/yum.html for the yum repo).  It's
> > entirely userspace.
> 
> Please move it into the kernel where it belongs, and use lcd
> brightness subsystem like everyone else.

We've been through this before.
http://marc.theaimsgroup.com/?l=linux-kernel&m=114067198323596&w=2

In addition, the SMI call used to change the backlight level *may*
require (if configured by the sysadmin in BIOS), a password be
entered.

This begs for a common userspace app that can grok libsmbios and
kernel interfaces both, and use the appropriate method on each, rather
than just putting it all in the kernel.

Thanks,
Matt

-- 
Matt Domsch
Software Architect
Dell Linux Solutions linux.dell.com & www.dell.com/linux
Linux on Dell mailing lists @ http://lists.us.dell.com
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