In the past I have used a script like this:

#!/bin/sh

echo Choose external resolution:
echo "   1.)  800x600"
echo "   2.) 1024x768"
read res
if [ "$res" == "1" ]; then
    startx -- -screen Screen2
fi
if [ "$res" == "2" ]; then
    startx -- -screen Screen1
fi

to choose from two different Screen sections (to specify the resolution 
of my external display to work on LCD projectors) when starting X.  You 
might be able to do the same by having two uniqely named device sections
and calling them in a similar fashion.

startx -- -device dual

Then again, maybe you can't have two device sections ... actually you 
should be able to since you can have two video cards.

Austin

Gene Holmerud wrote:
> Thanks to Eric "Shubes of Phoenix Linux User Group who corrected my 
> XF86Config, TwinView works (mostly) on my HP laptop under 9.1.  The only 
> inconvience is needing to comment/uncomment a few lines depending upon 
> whither the external monitor is present or not.  When configured for an 
> external monitor, TwinView insists on using the external as the prime 
> monitor, hence no system icons available if no external.
> 
> The following is the "Device" section of XF86Config for having an 
> external monitor (but with non-dual statements commented):
> 
> Section "Device"
>   BoardName    "0x031a"
>   BusID        "1:0:0"
>   Driver       "nvidia"
>   Identifier   "Device[0]"
>   VendorName   "NVidia"
>   Option       "TwinView"    "True"
> #  Option       "ConnectedMonitor" "DFP, CRT"
>   Option       "TwinViewOrientation" "CRT-0 RightOf DFP-0"
>   Option       "MetaModes"  "1024x768, 1024x768; 800x640, 800x640; 
> 640x480, 640x480"
> #  Option       "MetaModes" "NULL, 1024x768; NULL, 800x640; NULL, 640x480"
>   Option       "HorizSync"   "CRT-0: 31-64, DFP-0: 31-64"
>   Option       "VertRefresh" "CRT-0: 50, DFP-0: 60"
> #  Option       "HorizSync"   "DFP-0: 31-64"
> #  Option       "VertRefresh" "DFP-0: 50-78"
>   Option       "SecondMonitorHorizSync"   "CRT-0: 31-64"
>   Option       "SecondMonitorVertRefresh" "CRT-0: 50-78"
> EndSection
> 
> The following is the "Device" section for not having an external 
> monitor, but saving the dual statements as comments.
> 
> Section "Device"
>   BoardName    "0x031a"
>   BusID        "1:0:0"
>   Driver       "nvidia"
>   Identifier   "Device[0]"
>   VendorName   "NVidia"
>   Option       "TwinView"    "True"
> #  Option       "ConnectedMonitor" "DFP, CRT"
>   Option       "TwinViewOrientation" "CRT-0 RightOf DFP-0"
> #  Option       "MetaModes"  "1024x768, 1024x768; 800x640, 800x640; 
> 640x480, 640x480"
>   Option       "MetaModes" "NULL, 1024x768; NULL, 800x640; NULL, 640x480"
> #  Option       "HorizSync"   "CRT-0: 31-64, DFP-0: 31-64"
> #  Option       "VertRefresh" "CRT-0: 50, DFP-0: 60"
>   Option       "HorizSync"   "DFP-0: 31-64"
>   Option       "VertRefresh" "DFP-0: 50-78"
>   Option       "SecondMonitorHorizSync"   "CRT-0: 31-64"
>   Option       "SecondMonitorVertRefresh" "CRT-0: 50-78"
> EndSection
> 
> Hope this helps anyone else trying to do the same thing.
> 
> Gene
> 
> ------- Forwarded message -------
> From: Gene Holmerud <geneous@cox.net>
> To: "suse-linux-e@suse.com" <suse-linux-e@suse.com>
> Subject: [SLE] TwinView Multi-Monitors on a laptop???
> Date: Wed, 11 Aug 2004 21:13:12 -0700
> 
>> Was: [SLE] Nvidia now OK -- But how about Multi-Monitors on a laptop???
>>
>> James Ogley's reference to:
>>    Appendix R of
>> ftp://download.nvidia.com/XFree86/Linux-x86/1.0-6111/README.txt
>> helped a bunch!  So did a pretty good example at
>> http://weller.ws/toshiba/XF86Config-4.
>>
>> Unfortunately, I'm still getting a clone of the laptop display on the
>> external CRT.  But since it has a lower resolution that the laptop 
>> itself,
>> an oversize display is on the laptop requiring scrolling.  If I get a
>> desktop extension onto the external monitor, I will buy an external that
>> matches the laptop.
>>
>> I'm attaching the text of my XF86Config and XFree86.0.log (excerpts 
>> due to
>> this list's size limit).  If somebody has experienced this, I'd like some
>> tips.
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