From mboxrd@z Thu Jan  1 00:00:00 1970
From: Adam Jackson <ajax@redhat.com>
Subject: Re: Intel black screen
Date: Fri, 11 Nov 2011 11:30:38 -0500
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To: "Paulo J. Matos" <paulo@matos-sorge.com>
Cc: intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org

On 11/10/11 9:12 AM, Paulo J. Matos wrote:
> Hi,
>
> I got a new PC DELL Vostro 360. This is an all-in-one which uses the
> Optimus setup. An intel GT1 (Sandybridge) couples with an Nvidia 525m.
> Ubuntu out of the box shows a black screen unless I add nomodeset to
> kernel options.
>
> One of the things I noticed on a standard start (didn't use nomodeset)
> was that kworker was eating my processor away (this is ubuntu 11.10,
> kernel 3.0.0-12) but I sorted this out with:
> # echo N> /sys/module/drm_kms_helper/parameters/poll
>
> I blacklisted nvidia and nouveau so that my PC wouldn't go crazy with
> the optimus setup and restarted and still get a blank screen. Xorg on
> the other hand looks fine (from the logs).
>
> So, what I would like it some help in finding why I just get a blank
> screen. Can I possibly enable more debug information than that available
> in Xorg.0.log by default?

eDP's kind of flaky in some configurations still.  Can you attach your 
video BIOS so we can see how it's hooked up?

$ sudo dd if=/dev/mem of=/tmp/rom bs=64k skip=12 count=1

- ajax