Anyway I think your HDMI is limited due to Intel 4000 graphics.
"Intel graphics does not support dual-link, therefore 1920x1200 is the maximum for DVI and HDMI, 2560x1440 is only possible with a displayport port. This is stated in every specification sheet."
I get my Lenovo Twist demo unit today :)
Pretty similar to the Yoga but with one hinge.
Anyway I think your HDMI is limited due to Intel 4000 graphics.
"Intel graphics does not support dual-link, therefore 1920x1200 is the maximum for DVI and HDMI, 2560x1440 is only possible with a displayport port. This is stated in every specification sheet."
from
http://communities.intel.com/thread/30360