linux-kernel - Re: CONFIG_ACPI_VIDEO on Thinkpad blanks display.

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Message-ID: <20080925195820.GD30858@khazad-dum.debian.net>
Date:	Thu, 25 Sep 2008 16:58:20 -0300
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	carbonated beverage <ramune@...-ronin.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>, linux-kernel@...r.kernel.org
Subject: Re: CONFIG_ACPI_VIDEO on Thinkpad blanks display.

On Thu, 25 Sep 2008, carbonated beverage wrote:
> On Thu, Sep 25, 2008 at 11:07:46AM +0100, Matthew Garrett wrote:
> > > Without CONFIG_ACPI_VIDEO, the above message don't appear.  From this point,
> > > any pointers on figuring out why the ACPI features makes the screen go blank?
> > 
> > Yes. X assumed that any ACPI key press was a request to switch the video 
> > output. Upgrade X.
> 
> Since CONFIG_ACPI_VIDEO wasn't required before 2.6.26.x to change the LCD
> brightness, I'd rather the kernel go back to whatever it was doing for

Well, we do give you a way out: do not load ACPI video, and load
thinkpad-acpi with the proper parameters to enable its backlight control (if
it is getting disabled by default).  Check the docs.

> 2.6.25.x.  Upgrading X past what's currently packaged by the distribution
> just to get a new kernel working is somewhat of a pain.

Your X is broken, and in an extremely hideous way.  You could try to get it
to disable ACPI key support, or you can make sure nothing EVER sends ACPI
video events to it.  That means you must not use the ACPI video module in
your kernel until you install a fixed X.org.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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