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

[Sérgio Basto]

On Wed, 2020-09-23 at 00:44 -0700, Yuri wrote:
> Xorg for me starts with the resolution 1920x1080.
> 
> I know that 2560x1600 is supported because the NVidia settings
> program 
> can switch to 2560x1600 by typing 2560x1600 into it. The window
> manager 
> stays in a square with the size 1920x1080, and the extra space
> appears 
> around it.
> 
> 
> But how to change xorg.conf in order to make 2560x1600 a default
> resolution?
> 
> 
> I tried to add the line Modes into this section:
> 
>          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 may try xrandr command line , kde and gnome have gui's (display
configuration) 

> Thank you,
> 
> Yuri
> 
> 
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-- 
Sérgio M. B.