Comment 5 for bug 527428

I don't completely understand what is the error here.

Rotate works if you specify

Option "RandRRotation" "on"

in xorg.conf (at least for me). Error #148428 which is marked as duplicate to this has better description (assuming the problem is the same). I would propose to make that error primary and mark this as a duplicate to that.

(http://ubuntuportal.blogspot.com/2007/02/how-to-setup-pivot-screen-rotation-with.html)