Grub changes back to 420p dispite it being 1920x1080 in /etc/default/grub config file

Why you do not read?

Syntax is GRUB_GFXMODE=auto,1024x768x32 (sample)

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `videoinfo'
GRUB_GFXMODE=auto

and check what is possible, not what you like with

you can see them in real GRUB with the command `videoinfo'
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