From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Vetter <daniel@ffwll.ch>
Subject: Re: Screen unusable for console until X starts (945GM)
Date: Sat, 20 Oct 2012 20:33:01 +0200
Message-ID: <20121020183301.GD24005@phenom.ffwll.local>
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To: Rolf Eike Beer <eike-kernel@sf-tec.de>
Cc: "Nikula, Jani" <jani.nikula@intel.com>, Daniel Vetter <daniel.vetter@ffwll.ch>, intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org

On Sat, Oct 20, 2012 at 08:18:31PM +0200, Rolf Eike Beer wrote:
> Daniel Vetter wrote:
> > On Sat, Oct 20, 2012 at 2:20 PM, Rolf Eike Beer <eike-kernel@sf-tec.de> 
> wrote:
> > > I can switch the screen brightness during startup, but that only makes the
> > > black screen a dark grey screen, I still see no text.
> > 
> > Could be that we botch something with the enable sequence then. Can
> > you try 3.7-rc1 please (or the latest drm-intel-fixes tree from
> > http://cgit.freedesktop.org/~danvet/drm-intel)? The reworked modeset
> > code is reportedly better at not frying lvds panels ...
> 
> Same behavior as before, dmesg attached.
> 
> $ rpm -qi kernel-vanilla-3.7.rc1.next.20121019-1.1.i686 | tail -n 7
> The standard kernel - without any SUSE patches
> 
> 
> Source Timestamp: 2012-10-19 18:37:40 +0200
> GIT Revision: 375041b9f8fcf7c3f5890dea352c9f61f7695f0a                                                                                                                   
> GIT Branch: linux-next                                                                                                                                                   
> Distribution: Kernel:linux-next         
> 
> Greetings,

I've misread your dmesg, there's actually nothing wrong with the backlight
settings that the i915 driver does. One thing to figure out is which
backlight controller actually controls your backlight. Can you check out
all the exposed controls in /sys/class/backlight and experiment around
which ones have an effect?

I'm pretty sure that it's the backlight and not a modeset gone wrong,
since We don't do another modeset when X starts (it takes over the current
setup).
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch