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Date: Sun, 08 Feb 2009 15:16:48 +0100
From: Christoph Mallon <christoph.mallon@gmx.de>
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To: Oliver Fromme <olli@lurza.secnetix.de>
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Cc: freebsd-current@FreeBSD.ORG
Subject: Re: CFT: Graphics support for /boot/loader
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Oliver Fromme schrieb:
> Antonios Anastasiadis wrote:
>  > I've got the red border on a TFT monitor by the way.
> 
> OK, yeah, the problem is more widespread than I thought.
> Obviously some TFT monitors (probably wide-screen ones in
> particular) aren't scaling VGA modes to the full size of
> the screen, so the border bug becomes visible.

This "bug" is called "overscan" and is actually a feature of graphics 
cards. The overscan colour index can be selected with the "Overscan 
Color" register (0x11) of the attribute controller (port 0x3C0). You can 
even set a colour which is outside of the 0-15 range, so you get a 17th 
colour for the border!