Ubuntu 12.10
MacPro3,1

stock 3.5 kernel and 3.7-rcX ppa kernel

booting via efi with grub2

ati cards have broken framebuffer on 3.7 (all is fine on 3.5)

tried 2600xt, 6870, 6970 (all have efi part in rom, showing efi boot screen)

on 3.7, when radeonfb activates, I see for a moment two sides of screen (left
and right) swapped (not mirrored), then(when X start) only very few lines on
top of screen is actualy showing something(I can see part of mouse pointer
there), rest is filled with one color.

Same result with all cards I mentioned.