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

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Message-ID: <20061011070412.GA6128@srcf.ucam.org>
Date:	Wed, 11 Oct 2006 08:04:12 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Yu Luming <luming.yu@...il.com>,
	Matt Domsch <Matt_Domsch@...l.com>,
	Pavel Machek <pavel@....cz>, 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 Wed, Oct 11, 2006 at 08:59:04AM +0200, Arjan van de Ven wrote:

> it'd also be nice if the linux-ready firmware developer kit had a test
> for this, so that we can offer 1) a way to test this to the bios guys
> and 2) encourage adding/note the lack easily

Sure. Reading /proc/acpi/video/*/*/info should tell you whether a device 
is an LCD or not. The brightness file should then contain a list of 
available brightnesses, and writing one into there should change the 
screen value. There's a patch somewhere that ports this to the 
/sys/class/backlight infrastructure, but I don't think it's applied yet.

I'd write a test up for you, but I don't actually seem to have any 
hardware that implements this properly. Tch.
-- 
Matthew Garrett | mjg59@...f.ucam.org
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