Just to double check you mentioned there is Lenovo firmware, is this an OEM model from Lenovo?
It's purchased from Lenovo, yes.
I managed to get direct attaching to work between 2 hosts after recreating the vSwitch.
Anyway now I connected the 10Gb links directly on a 10Gb switch and the X710 ports are now switching between 10000 FULL and down state.
I also tried older vmware drivers but this didnt help either. :/
Thank you for the reply. Please contact Lenovo to further check with them as this is an OEM network adapter.