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

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Date:	Wed, 11 Oct 2006 11:04:48 +0300
From:	Ismail Donmez <ismail@...dus.org.tr>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	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
Subject: Re: [PATCH 2.6.18-mm2] acpi: add backlight support to the sony_acpi driver

11 Eki 2006 Çar 10:04 tarihinde, Matthew Garrett şunları yazmıştı: 
> 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. 

On my Sony Vaio with latest linux-2.6 git kernel it says its a CRT :

[~]> cat  /proc/acpi/video/*/*/info
device_id:    0x0100
type:         CRT
known by bios: no
device_id:    0x0320
type:         UNKNOWN
known by bios: no
device_id:    0x0410
type:         UNKNOWN
known by bios: no
device_id:    0x0240
type:         UNKNOWN
known by bios: no
device_id:    0x0100
type:         CRT
known by bios: no
device_id:    0x0111
type:         UNKNOWN
known by bios: no
device_id:    0x0118
type:         UNKNOWN
known by bios: no
device_id:    0x0200
type:         TVOUT
known by bios: no

So I don't think its reliable.

Regards,
ismail
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