I want to know my GRUB resolution ? and what if I set the GRUB background image that is higher or lower resolution than current grub resolution , do I have to resize it ?
The best way I have found to manage the GRUB screen / resolution / text-size is to use "Grub_Customizer"
It works for GRUB and BURG both
Open a terminal and enter:
then you can fully manage the GRUB screen
I agree with "BlueXrider", however I could not get the ppa listed to work, so this is the one I would use:
it comes from the person that makes or manages the "Grub Customizer"
(Follow the same instructions from 'BlueXrider', just change the ppa in the instructions.)