Thank you Jack, Amit and José for your quick response.
It works!

I have edited /etc/X11/xorg.conf
It now has Virtual 2304 768 as explained below by José

The command I use to enable dual head is
xrandr --output LVDS --mode 1024x768 --output VGA-0 --mode 1280x1024
--left-of LVDS

I'm still investigating ways to make the screen mode persistent after a
reboot.
It seems like I need to write a bash script.

I also have sound working.
I've added this line to /etc/modules
snd-powermac

Regards
Jamie Downs



2009/5/8 José JORGE <lists.jjo...@free.fr>

> A Friday 8 May 2009 03:36:23, Jamie Downs escreveu:
> > I'd like to run it in dual head mode with the external monitor at
> > 1200x1024.
>
> You must indicate in the xorg.conf that you want to use a virtual screen
> bigger than your laptop's one. Here is what I have for two 1024x768 screens
> side by side.
>
> Section "Screen"
>    Identifier "screen1"
>    Device "device1"
>    Monitor "monitor1"
>    SubSection "Display"
>            Virtual 2048 768
>    EndSubSection
> EndSection
>
> You will need 1280+1024 (I suppose a typo in the 1200) horizontaly so :
>
> Virtual 2304 1024
>
> Than as said you can get it OK with something like (my own script, adapt to
> your config) :
>
>        xrandr --addmode VGA-1  1024x768
>        xrandr --output VGA-1 -s 1024x768
>        xrandr --output VGA-1 --auto
>        xrandr --output VGA-1 --right-of LVDS
>
>
> You may have some problems with 3D (DRI) as 2304 > 2048...
>
>
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