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From: Yu Luming <luming.yu@gmail.com>
Organization: gmail
To: Ismail Donmez <ismail@pardus.org.tr>
Subject: Re: [PATCH 2.6.18-mm2] acpi: add backlight support to the sony_acpi driver
Date: Thu, 12 Oct 2006 00:31:13 +0800
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Cc: Matthew Garrett <mjg59@srcf.ucam.org>,
       Arjan van de Ven <arjan@infradead.org>,
       Matt Domsch <Matt_Domsch@dell.com>, Pavel Machek <pavel@ucw.cz>,
       Andrew Morton <akpm@osdl.org>,
       Alessandro Guido <alessandro.guido@gmail.com>,
       linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
       len.brown@intel.com, jengelh@linux01.gwdg.de, gelma@gelma.net
References: <20060930190810.30b8737f.alessandro.guido@gmail.com> <20061011070412.GA6128@srcf.ucam.org> <200610111104.50563.ismail@pardus.org.tr>
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On Wednesday 11 October 2006 16:04, Ismail Donmez wrote:
> 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.
Please open a bug on bugzilla.kernel.org,
and post acpidump output. 

Thanks,
Luming

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