scratch that, 8700P has not been certified.
You probably should try running newer mainline kernel builds to see if they work better, and do a rough bisect to see where it got fixed:
http://kernel.ubuntu.com/~kernel-ppa/mainline/
The amdgpu driver on 16.04 kernel is essentially backported from 4.5, so start with 4.7 and if it works, try 4.6 etc.
scratch that, 8700P has not been certified.
You probably should try running newer mainline kernel builds to see if they work better, and do a rough bisect to see where it got fixed:
http:// kernel. ubuntu. com/~kernel- ppa/mainline/
The amdgpu driver on 16.04 kernel is essentially backported from 4.5, so start with 4.7 and if it works, try 4.6 etc.