linux-kernel - Re: [regression] Re: Controlling backlight on thinkpad x60

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Date:	Tue, 9 Sep 2008 17:36:54 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	ACPI mailing list <linux-acpi@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [regression] Re: Controlling backlight on thinkpad x60

On Tue 2008-09-09 17:28:59, Pavel Machek wrote:
> On Mon 2008-09-08 16:54:58, Matthew Garrett wrote:
> > On Mon, Sep 08, 2008 at 05:10:58PM +0200, Pavel Machek wrote:
> > 
> > > (I do have CONFIG_ACPI_VIDEO disabled, it killed my machine last time
> > > I enabled it, is it mandatory now?)
> > 
> > On Thinkpads with ACPI video support, yes.
> 
> That's bad then, because ACPI video support does not work here. I can
> boot, and even Fn-home/end works, but it breaks with X.
> 
> In old versions, it resulted on black screen after LID close in X.
> 
> In 2.6.27-rc5, screen goes black as soon as X are started.

Hmm, I have updated my X server, and it now works with
ACPI_VIDEO... which means that this is probably not affecting huge
number of people.

Hmm... something is still funny. I have 

root@amd:/sys/class/backlight/acpi_video0# echo 1 > brightness
root@amd:/sys/class/backlight/acpi_video0# echo 0 > brightness
root@amd:/sys/class/backlight/acpi_video0# cd ../acpi_video1/
root@amd:/sys/class/backlight/acpi_video1# echo 0 > brightness
root@amd:/sys/class/backlight/acpi_video1# echo 7 > brightness
root@amd:/sys/class/backlight/acpi_video1# echo 0 > brightness


...and both acpi_video0 *and* acpi_video1 works... strange.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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