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

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Message-ID: <20061006224436.GD29690@elf.ucw.cz>
Date:	Sat, 7 Oct 2006 00:44:36 +0200
From:	Pavel Machek <pavel@....cz>
To:	Matt Domsch <Matt_Domsch@...l.com>
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

Hi!

> > 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 is crazy, password-protected backlight level?

Can you make sure this crazyness does not infect newer models?

> 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.

Kernel is expected to provide hardware abstraction. libsmbios will
mean person able to change backlight will be able to do lots of
strange stuff...
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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