How to enable Radeon Pro Duo with mesa

[Lvzhihong (ReJohn)]

Hi All ,
Does mesa support Radeon Pro Duo? I don't know how to configure xorg.conf to use two WX7100 card of DUO , and now I can only use the first card of DUO.
Installed software packages: xserver-xorg  xfce4  xinit
Mesa version: 17.2.8  kernel version: 4.15

Pci information:
000d:31:00.0 PCI bridge: PLX Technology, Inc. PEX 8747 48-Lane, 5-Port PCI Express Gen 3 (8.0 GT/s) Switch (rev ca)
000d:32:08.0 PCI bridge: PLX Technology, Inc. PEX 8747 48-Lane, 5-Port PCI Express Gen 3 (8.0 GT/s) Switch (rev ca)
000d:32:10.0 PCI bridge: PLX Technology, Inc. PEX 8747 48-Lane, 5-Port PCI Express Gen 3 (8.0 GT/s) Switch (rev ca)
000d:33:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon Pro WX 7100]
000d:33:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device aaf0
000d:34:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon Pro WX 7100]

My xorg.conf:
Section "Device"
       Identifier "AMD"
       Driver "amdgpu"
       BusID "pci:51 at 13:00:00"
EndSection
Section "Monitor"
        Identifier "monitor0"
        Option "enable" "true"
EndSection
Section "Screen"
        Identifier "screen0"
        Device "AMD"
        Monitor "monitor0"
        DefaultDepth 24
        SubSection "Display"
                Depth 24
        EndSubSection
EndSection

I use "startx" to start desktop , and only the first WX7100(PCI Bus ID: 000d:33:00.0) being used , the second WX7100(PCI Bus ID: 000d:34:00.0) has no load .
         Even if I set BusID as "pci:52 at 13:00:00" (the second WX7100), it still only the first WX7100 being used.

      So , How to enable Radeon Pro Duo with opensource driver , does my xorg.conf is wrong or mesa doesn't support Radeon Pro Duo?


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