Just been playing with my new install and am having the same problems I had in 9.04 with the graphics glitch on shutdown. The old cure was to add vga=791 to my menu.lst.
Where would I add this in grub2? Had a quick look at the wiki, but it's not giving me any joy... I "could" edit the grub.cfg file, but it looks like this is a big no-no.
EDIT: SOLVED see HERE