From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ivan Bulatovic <combuster@gmx.com>
Subject: Re: External display
Date: Fri, 14 Jan 2011 14:57:57 +0100
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To: Chris Wilson <chris@chris-wilson.co.uk>
Cc: intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org

On Fri, 2011-01-14 at 12:51 +0000, Chris Wilson wrote:
> On Fri, 14 Jan 2011 13:38:08 +0100, Christoph Lukas <christoph.lukas@gmx.net> wrote:
> > Hi,
> > 
> > I am using a Dell E6410 notebook running Ubuntu. Most of the time I am
> > running this notebook in a docking station with closed lid and with an
> > external (DVI) monitor attached to the dock.
> > 
> > Running different kernels I see different behaviour regarding the
> > display configuration after boot.
> > 
> > Booting a 2.6.32 based kernel the internal display is turned off, the
> > external display is turned on and running at it's native resolution of
> > 1920x1200. 
> > This is what I would expect.
> 
> Once upon a time we trusted the lid status and reported the internal
> screen as disconnected when the lid was closed. We were beset by bugs
> reporting broken lid status and the LVDS not working. So we gave up.
> Usually between the BIOS and userspace responding to lid notification
> events, the LVDS is turned off when the lid is closed.
> 

You can always boot with video=LVDS-1:d kernel parameter, that will
disable your LVDS connection and run your external monitor in native
resolution.

Only thing is, you have to remove that parameter every time you boot
your notebook without it being connected to docking station.