15.10 to 16.04 - AMD ATI Not displaying multiple monitors

I have an Radeon HD 7970/8970. Prior to 16.04, I had the proprietary AMD drivers installed. Dual monitors worked. During the upgrade to 16.04, I was aware that the proprietary drivers weren't supported. Before I upgraded, I removed them, installed the open source drivers and restarted. Everything continued to work. Once I upgraded the dual monitors weren't displayed. The system only sees one monitor, but the display is setup to mirror on both.

I booted from the 16.04 Live CD and confirmed that the other monitor would work and it does.

I'm not sure what to do, any ideas to try and get my other monitor working would be great.