I've read WiDi is *not* ok for gaming. The intended used is for streaming movies and other video content. There is a .5 second lag between what is happening on the laptop display and the tv, which sounds horrible for gaming.
When googling around, I found a little blurb on Anandtech:
"How about gaming? WiDi 1.0 apparently had latency of around 0.5 seconds, which makes it practically useless for anything more than viewing movies and perhaps browsing the web (though even with browsing, using the mouse and seeing a half second delay would be super agravating). WiDi 2.0, at least on this particular notebook, appears to have trimmed latency down to around 0.1 to 0.2 seconds. This makes it far more useful if you're using the mouse, but even then there's a noticeable lag. For FPS gaming, the delay is unacceptable. RTS games would probably be out of the question as well, unless you're not into measuring your CPM (clicks per minute). I did try both types of games, and I quickly stopped playing after feeling a bit motion sick because of the difference between when I expected things to happen and when they actually happened on the screen. Yuck. One type of game still worked alright, however: driving simulations (and potentially flight sims as well). I played a few races of DiRT 2, and because turning, stopping, accelerating, etc. aren't instantaneous, the .1 second delay didn't bother me much. Of course, YMMV."
http://www.anandtech.com/show/4649/mythlogic-pollux-1400-clevos-w150hr-tested/8