Stuck with bootresolution being too low

During boot, after selecting boot loader option almost until login monitors display pretty low resolution for the text outputs (a split second before login screen it becomes normal after a blink).

Here is a small post on how I “fixed” the same issue on my system (when I wrote the post I was using a NVIDIA GPU but it still works on my new AMD one):

EDIT: But I would remove this first when trying the video=efifb method:

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