I see it in the CCC, but the option is just greyed out to "Landscape".
Here's a SS.http://i40.tinypic.com/27y8zyr.png
greyed out means your graphic card is capable of doing it, but some thing is preventing it from making it possible/happen. For example if you already select 1280x1080, this is by default landscape, so setting would grey out. Just an example, not saying that's the problem in your case. Portrait/landscape mode is set by the graphic card, not monitor or O/S. Seek the gx card manufacturer or help.