so i have setup kali on my rasppi and installed the re4son kernel to get bluetooth working and then went ahead and installed the hexxeh kernel just to stay up to date... i have a 7 inch touch screen display the Official one installed but i want to work on a bigger screen..how can i mirror my screen on to HDMI ?? at the moment .. when i connect the HDMI to a monitor..the screen is blank.. and only the 7 inch screen works and the monitor is blank.. is there a way to like mirror the screen on both the devices..???