Choosing grub2 video modes

[Alex Regan]

Hi,

I'm confused about how to control the text video mode from grub. I've 
seen references to GRUB_GFXMODE and gfxmode, but I don't understand how 
it's set.

I've tried setting it using "set gfxmode=640x480" in 
/boot/grub2/grub.cfg and other variations, but they seem to be ignored.

I've tried setting GRUB_GFXMODE=640x480 in /etc/default/grub then 
recreating grub.cfg, but that also doesn't appear to work.

I'd appreciate it if someone could share some examples of how to do it 
on current versions of fedora.

I've also tried using 'vbeinfo' while inside grub, but those numbers 
(0x114, for example) don't seem to have any effect either.

How can I tell what resolution the console is currently set to?

Thanks,
Alex