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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