Linux
Arch
Change grub resolution:
sudo subl /etc/default/grub
Edit (run videotest from grub via c to see supported)
GRUB_GFXMODE=1024x768x32
Rebuild grub with this or equiv
sudo grub-mkconfig -o /boot/grub/grub.cfg
In the same file you can change the default text resolution by appending the res to this line
GRUB_CMDLINE_LINUX_DEFAULT=quiet resume=UUID=75a2dd2e-c8d0-4400-a8c8-182ae551cb8d video=1600x900
Rebuild grub