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

[Yuri]

On 2020-09-23 23:02, Yuri wrote:
>
>
> Here is the log: https://people.freebsd.org/~yuri/Xorg.0.log


This log says that that the mode 2560x1600_60 is rejected because the 
pixel frequency is too high.


But when I changed "2560x1600" to "2560x1600_50" it now fails:

 > [ 91284.546] (WW) NVIDIA(GPU-0):     Mode is rejected: Only 
EDID-provided modes are allowed on
 > [ 91284.546] (WW) NVIDIA(GPU-0):     Samsung U28D590 (HDMI-0) 
(continuous frequency modes not
 > [ 91284.546] (WW) NVIDIA(GPU-0):     allowed).
 > [ 91284.546] (WW) NVIDIA(GPU-0):     Mode "2560x1600_60" is invalid.


This is even with Option      "IgnoreEDID"  "1"


Yuri