Xen users - Feb 2014 - Blank screen in EFI mode but XEN seems to work

Hi!

I installed XEN 4.3.2 on my Gentoo Linux machine with EFI-Support.

DETAILS:
Motherboard: ASUS M5A97
Graphiccard: Radeon HD 5000/6000/7350/8350 Series

ISSUE:
When booting from xen.efi i get instantly a blank screen, but the XEN 
Hypervisor boots and i am able to SSH into it.
Also i am able to issue commands in "blind mode".

When i boot from grubx64.efi grub tells me "no console will be available 
to os" after "multiboot"-command and "no suitable video mode
found"
after "module"-command.

So i am not able to get any visual output when booting the XEN-Kernel.

Booting the Linux-Kernel from GRUB works as expected.

So, what's wrong?

Liebe Grüße aus Freilassing,

Michael Rack
RSM Freilassing
-- 
RSM Freilassing                 Tel.: +49 8654 607110
Nocksteinstr. 13                Fax.: +49 8654 670438
D-83395 Freilassing            www.rsm-freilassing.de