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So I am trying to set up a monitor with a higher resolution using;

hdmi_group=2 hdmi_mode=77

But when I boot, I the monitor reverts to 1920x1080 i.e. hdmt_mode 82

Is there a location where I can add a resolution to the file associated with the attached monitor. I appreciate the monitor may not support this mode, but I would like to be able to add a custom mode to the list of available modes for the monitor, hence wanting to identify and locate the specific file that is read by the Pi configuration app.

Any advice?

3

Not all of the video modes shown in the documentation are supported -- which begs the question why they are shown at all. In any case, underneath the table for group 2 there's a note:

Note that there is a pixel clock limit. The highest supported mode is 1920x1200 at 60Hz with reduced blanking.

If you click through the link, you will find a Pi Foundation forum thread where an Engineer makes it explicit:

That is the list of all the standard CEA/DMT modes. Additionally there is a pixel clock limit which means modes bigger than 1920x1200@60 are not supported.

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