Thanks for your reply.

My homescreen is portrait. So are contacts, dialer and few others.

Since i got this from ebay, i also did a clear-device.
But before the reset and after, browser etc., has always shown up in landscape.

I did install Home Screen and N9Tweaks(after seeing these are landscape), but havent set anything through these.
I will try to do another factory reset and maybe a f/w re-write.

Is there anything else i can try out?