How to switch to a particular resolution? Xorg complains "No valid modes for "DFP-1:2560x1600"; removing." and ignores my setting.

[Adam Nielsen]

>          SubSection "Display"
>                  Viewport   0 0
>                  Depth     1
>                  Modes      "2560x1600" "1920x1080"
>          EndSubSection
> 
> But Xorg fails to accept the 2560x1600 value with this warning:
> 
> [  9995.669] (WW) NVIDIA(0): No valid modes for "DFP-1:2560x1600"; removing.
> 
> and still uses 1920x1080.

You could try the IgnoreEDID option in case the monitor isn't reporting
its valid modes correctly.  But I'm not sure why you have Depth 1
(monochrome) rather than the more usual 24 or 32.  What happens if you
set Depth 32?

If that doesn't work, what monitor, video card, and cable type are you
using? (e.g. HDMI, Dual DVI, or DisplayPort)

Cheers,
Adam.