Is it normal that i cannot set 3840x1080?

i just created a resolution with xrandr (3840x1080) but when i choose it in the parameters it just blackscreen and return to 800x600 (4:3), is it normal ?

Hi and welcome to the forum.
I see from your profile you ave Z16 Core (gnome).
What graphics card do you have ?

Don't know if either of these help:

Never saw such resolution, don't know even if it exist

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