From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lekensteyn <lekensteyn@gmail.com>
Subject: Re: [PATCH] i915: initialize CADL in opregion
Date: Wed, 27 Jun 2012 17:09:02 +0200
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References: <1574631.uSlQXEJRId@al> <20120626210755.GB5072@phenom.ffwll.local>
	<20120627150302.GE5326@phenom.ffwll.local>
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To: Daniel Vetter <daniel@ffwll.ch>
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On Wednesday 27 June 2012 17:03:02 Daniel Vetter wrote:
> On Tue, Jun 26, 2012 at 11:07:55PM +0200, Daniel Vetter wrote:
> > On Tue, Jun 26, 2012 at 02:04:00PM -0700, Jesse Barnes wrote:
> > > On Tue, 26 Jun 2012 00:36:24 +0200
> > > 
> > > Lekensteyn <lekensteyn@gmail.com> wrote:
> > > > This is rather a hack to fix brightness hotkeys on a Clevo laptop.
> > > > CADL is not used anywhere in the driver code at the moment, but it
> > > > could be used in BIOS as is the case with the Clevo laptop.
> > > > 
> > > > The Clevo B7130 requires the CADL field to contain at least the ID of
> > > > the LCD device. If this field is empty, the ACPI methods that are
> > > > called
> > > > on pressing brightness / display switching hotkeys will not trigger a
> > > > notification. As a result, it appears as no hotkey has been pressed.
> > > 
> > > Not ideal, but definitely better than nothing.
> > > 
> > > Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
> > 
> > Queued for -next, thanks for the patch.
> 
> Unfortunately this results in a neat black screen on my ivb zenbook. Until
> I've figured out what exactly's going on, I have to drop this from -next
> again.
> -Daniel

Can you share your acpidump on 
https://bugs.freedesktop.org/show_bug.cgi?id=45452 ?
TIA
Peter