looks like my issue at http://communities.intel.com/message/83957#83957
I found out that the resolution on DVI Port is scumbled (1669 x 1067 someting like this) if HDMI is connecte during boot. Probably your display on DVI will not show this resolution and thats why it seems like disabled.
I spoke with a guy from support and he told me that my display must be damaged. It's not possible that intel firmware is buggy at this point....no comment on that.