Dual monitors with displayport to HDMI ubuntu 12.04

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http://askubuntu.com – So I have a lenovo T510 laptop running Ubuntu 12.04 x64. I can run dual monitors with my main display and internal, but not internal and displayport. The displayport is connected to a dp to HDMI converter, which works perfectly in windows. In Ubuntu, when I connect the TV, the internal screen works, but the TV goes white, and the adapter gets really hot after a while. Also the screen doesn't show up in the displays menu even when I spam the detect displays button. Any solutions? PS Accoring to ubuntu, there are no proprietary drivers for this system. The card is a Nvidia. (HowTos)