Running Ubuntu 14.04 on a Lenovo Edge 535 laptop. When I connect my HDMI cable in order to connect the laptop to the TV the screen splits horizontally and the OS becomes unresponsive.
Screenshot:

Am I missing something in connecting my laptop to an external monitor?
Memory 3.2GiB
Processor AMD A8-4500M APU with Radeon(tm) HD Graphics x 4
Graphics Gallium 0.4 on AMD ARUBA
OS Type 64-bit
Disk 602.1 GB