Hi - yes I got it working!
The APPLE minidisplay port adaptor doesnt work on the X1, this is exactly what I purchased - but missed the important part which says "only compatible with apple products" ... silly me. (shown here http://store.apple.com/uk/product/MB572Z/A
So I purchased a startech adaptor and it works perfectly !
(http://intrl.startech.com/AV/Displaypor ... er~MDP2VGA
This startech adaptor is available in UK for about £16, so it is not expensive. If you cannot get this in korea let me know, I can assist you to get one (maybe sell to you from ebay?)