kernel 3.1 switch to console display nothing

[masuch]

Hi,

I have compiled kernel 3.1 64 bit for ubuntu oneiric with configuration for CORE2 march=native and mtune=native. I have two versions, one is compiled with ubuntu patches and second one without ubuntu patches.

(I have maximus iv extreme R3 BIOS 1850 motherboard. HD6990 with catalyst 11.8 properly working).

I have problem to switch to console by Ctlr+Alt+FN1.

It is always switched properly into console but has displayed blank screen.
(I can type login name and password and it evidently made login)
but I do not see anything displayed.

The problem is not catalyst graphic driver because when I ran under xorg-edgers compiled kernel 3.1 or another kernel from ubuntu ppa - it works just fine - console behaves normally.

Could anybody please help to kernel newbie to let me what am I missing within kernel compilation?

thanks a lot for any clue,
regards,
Martin