Laptop VGA cards are only two types: independently driven, or
mirrored.  The former is what allows the internal and external to
display different things simultaneously.  The latter is a 1:1 mirror
image on one and other.  All laptops I've seen when the external VGA
is enabled are mirrored.  Via VGA driver functions, you can make them

My guess for what you need is xrandr, to which I'm not very well
versed.  It seems to be "the answer" when it comes to video output
layout, size, orientation...  swiss army knife.

I'm welcome to corrections and learning myself, but I would shoot for
VGA driver and/or xrandr tweaking first.

On 6/8/09, Aryeh M. Friedman <> wrote:
> I have following hardware on my laptop:
>  > dmesg|grep vga
> vgapci0: <VGA-compatible display> port 0x6110-0x6117 mem
> 0x90000000-0x903fffff,0x80000000-0x8fffffff irq 16 at device 2.0 on pci0
> agp0: <Intel GM45 SVGA controller> on vgapci0
> vgapci1: <VGA-compatible display> mem 0x94500000-0x945fffff at device
> 2.1 on pci0
> vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
> drm0: <Mobile Intel\M-B\M-. GM45 Express Chipset> on vgapci0
> vgapci0: child drm0 requested pci_enable_busmaster
> and I have an extrtnal 21" widescreen (vga) that when I hook it up the
> default x11.config  has it  at  1024x768 on *BOTH*  monitors.... How do
> I make it so X only considers the external (if attached) monitor?
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