Note: That's the Old School method... Here's How To Set Grub VGA Modes and Resolution nowadays. How to set gfxmode for GRUB to use at Boot With recent GRUB configurations, modes can be set by simply adding the resolution and color depth to your grub.cfg file. For example, to set the graphics mode in the GRUB (GRand Unified Bootloader) configuration (grub.cfg), you can add or modify the gfxmode ent