Comment 17 for bug 661450

I get a ridiculous amount of bugs trying to use a secondary display not to mention extended desktop which I can't get to work at all. Sometimes it just shows the secondary screen black, sometimes it shows a panel, sometimes the primary screen has a wallpaper but the other doesn't and sometimes Unity stops working, the only constant thing is that it's always extremely laggy. Also sometimes It simply freezes the computer completely and can only make it work again restarting.