Black screen amdgpu error: no EDID read

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Some where in System Setup → DisplayPort Version
But can you try using grub instead of systemd? (newbie) Unable to change the screen resoultion using xrandr - #7 by axolotlKing
just change this in your config:

#delete that
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

#add this:
  boot = {# Bootloader
    loader = {
      efi.canTouchEfiVariables = true;
      grub ={
        enable = true;
        device = "nodev";
        efiSupport = true;
        useOSProber = true;
      };
    };
  };