Ubuntu: why is R9 390 using radeon instead of amdgpu driver?



Question:

My R9 390 is using the open source radeon driver instead of the amdgpu driver. When first installing my system the "xserver-xorg-video-radeon" wasnt even installed. it was just the libs which seem to be tied to other dependencies. So i just decided to install the whole package anyway. Which i can uninstall still... but it still wont switch to amdgpu for some reason.

I would like to know how i can get my R9 390 to use the amdgpu drivers.

also i am using 16.04 LTS

sudo lspci -nnv -s  01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Hawaii PRO [Radeon R9 290/390] [1002:67b1] (rev 80) (prog-if 00 [VGA controller])      Subsystem: Tul Corporation / PowerColor Radeon R9 390 [148c:2358]      Flags: bus master, fast devsel, latency 0, IRQ 134      Memory at c0000000 (64-bit, prefetchable) [size=256M]      Memory at d0000000 (64-bit, prefetchable) [size=8M]      I/O ports at e000 [size=256]      Memory at dfe00000 (32-bit, non-prefetchable) [size=256K]      Expansion ROM at 000c0000 [disabled] [size=128K]      Capabilities: [48] Vendor Specific Information: Len=08 <?>      Capabilities: [50] Power Management version 3      Capabilities: [58] Express Legacy Endpoint, MSI 00      Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+      Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>      Capabilities: [150] Advanced Error Reporting      Capabilities: [200] #15      Capabilities: [270] #19      Capabilities: [2b0] Address Translation Service (ATS)      Capabilities: [2c0] #13      Capabilities: [2d0] #1b      Kernel driver in use: radeon      Kernel modules: radeon      sudo dpkg -l | grep amdgpu  ii  libdrm-amdgpu1:amd64                                            2.4.68+git1606141830.625d18~gd~x         amd64        Userspace interface   to amdgp-specific kernel DRM services -- runtime  ii  libdrm-amdgpu1:i386                                             2.4.68+git1606141830.625d18~gd~x         i386         Userspace interface   to amdgp-specific kernel DRM services -- runtime  ii  xserver-xorg-video-amdgpu 1.1.99+git1606281932.a57643~gd~x          amd64 X.Org X server -- AMDGPU display driver    sudo dpkg -l | grep radeon  pi  libdrm-radeon1:amd64                                            2.4.68+git1606141830.625d18~gd~x         amd64        Userspace interface   to radeo-specific kernel DRM services -- runtime  ii  libdrm-radeon1:i386                                             2.4.68+git1606141830.625d18~gd~x         i386         Userspace interface   to radeo-specific kernel DRM services -- runtime  ii  xserver-xorg-video-radeon 1:7.7.99+git1606280732.3be841~gd~x        amd64 X.Org X server -- AMD/ATI Radeon display driver    sudo uname -r  4.6.3-040603-generic  

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