MHL via root?

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http://forums.androidcentral.com – hello, i am new here (you may know me from WPcentral though) but im getting a nexus 7 wednesday and i read that via root you can enable usb OTG, has anyone tried using a MHL cable when rooted? i really want to be able to mirror my screen to my google tv, otherwise ill just stick to dlna for streaming videos. thanks! (HowTos)