2014-05-07, 09:25 (This post was last modified: 2014-05-07, 09:25 by fritsch.)
It does not. Could be a known feature by your TV ... "optimizing Contrast" or something. Try xbmc Limited option unset and keep your hdmi on limited (remove the xrandr hack) and compare.
First decide what functions / features you expect from a system. Then decide for the hardware. Don't waste your money on crap.