[ltp] External video on T61

[Martin Aumueller]

On Tuesday 20 May 2008, Micha wrote:
> On Mon, 19 May 2008 16:55:27 -0700
[...]
>
> The only option that worked for me at the time was to set the external
> screen to 640x480 and disable the internal screen using nvidia settings.
> Don't save to xorg.conf or you will have trouble later on.

nvidia-settings allows for lots of different options on my internal 1400x1050 
LCD with the following line in the "Device" section for my nvidia card:

Option          "ModeValidation" "NoDFPNativeResolutionCheck,NoVertRefreshCheck,NoHorizSyncCheck,AllowNon60HzDDFPModes,NoEdidMaxPClkCheck"

I didn't bother to find which of this options is sufficient, but I think that 
perhaps NoDFPNativeResolutionCheck might already do the trick.

Regards,
Martin