Change grub resolution on arch

ArchLinux

sudo vim /etc/default/grub

Change GRUB_GFXMODE=1920x1080x32

Rebuild grub

grub-mkconfig -o /boot/grub/grub.cfg

From https: //wiki.archlinux.org/index.php/GRUB/Tipsandtricks#Settingtheframebuffer_resolution