linux-kernel - Re: ACPI video.c brightness handler conflicts with toshiba

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Message-Id: <1220836432.3441.25.camel@rzhang-dt>
Date:	Mon, 08 Sep 2008 09:13:52 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Andrey Borzenkov <arvidjaar@...l.ru>
Cc:	toshiba_acpi@...ebeam.org, linux-acpi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: ACPI video.c brightness handler conflicts with toshiba_acpi

On Sat, 2008-09-06 at 11:08 +0400, Andrey Borzenkov wrote:
> I have now two different devices that refer to the same hardware:
> 
> lrwxrwxrwx 1 root root 0 2008-09-06 11:04 acpi_video0 -> ../../devices/virtual/backlight/acpi_video0/
> lrwxrwxrwx 1 root root 0 2008-09-06 11:04 toshiba -> ../../devices/virtual/backlight/toshiba/
> 
> Unfortunately, due to ACPI implementation the acpi_video0 one is much
> inferior (as it provides only effectively two levels instead of 8);
> and user level tools are apparently quite confused which one to select.
> 
> Is there any mechanism that would allow tochiba_acpi to claim brightness
> for internal LCD screen that video would not attempt to grab it too?
> 
Yes, the patches are in Andi's test tree currently.

please run
#git-clone
git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-acpi-2.6
acpi_test
#git-branch -r
#git-branch --track test origin/test
#git-checkout test

to get the source code if you want to give it a try. :)

thanks,
rui

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