If anyone trying the same, you can get S7150 working in Linux using
Assuming S7150 PCI ID is "08:00.0" in this case. You will need to replace with PCI id for your setup.
1. Amdgpu-pro 18.30 driver
2. /usr/share/X11/xorg.conf.d/00-amdgpu.conf ( remove all other conf files from /usr/share/X11/xorg.conf.d/ )
with
```
Section "Device"
Identifier "AMD FirePro S7150"
Driver "amdgpu"
Option "AccelMethod" "glamor"
Option "TearFree" "on"
Option "DRI" "3"
BusID "PCI:08:00"
EndSection
Section "Files"
ModulePath "/opt/amdgpu-pro/lib/xorg/modules"
ModulePath "/opt/amdgpu/lib/xorg/modules"
ModulePath "/usr/lib/xorg/modules"
EndSection
```
3. /etc/modprobe.d/amdgpu.conf
options amdgpu virtual_display=0000:08:00.0,1
After this you can get X working on the virtual display attached to S7150.
You can use x11vnc to confirm that.