Ubuntu – AMD-GPU on Ubuntu 16.04

I have AMD A10-7870K CPU with R7 GPU. I have setup the system to use amdgpu instead of radeon. The kernel module is loaded properly. I blacklisted radeon module by putting 'blacklist radeon' into /etc/modprobe.d/blacklist-radeon.conf and added 'amdgpu' into /etc/initramfs-tools/modules. Then ran sudo update-initramfs -u

Yet, the radeon module keeps getting loaded and I don't know why…

root@ubuntu:~# lsmod |grep -e radeon -e amdgpu
amdgpu                987136  0
radeon               1515520  3
i2c_algo_bit           16384  2 amdgpu,radeon
ttm                    94208  2 amdgpu,radeon
drm_kms_helper        155648  2 amdgpu,radeon
drm                   364544  7 ttm,drm_kms_helper,amdgpu,radeon
root@ubuntu:~#

At /etc/X11/xorg.conf.d/20-amdgpu.conf I have

Section "Device"
    Identifier "AMD"
    Driver "amdgpu"
EndSection

However at Xorg.0.log I see:

[    17.774] (II) [KMS] Kernel modesetting enabled.
[    17.774] (EE) AMDGPU(0): amdgpu_device_initialize failed
[    17.774] (II) [KMS] Kernel modesetting enabled.
[    17.774] (EE) AMDGPU(G0): amdgpu_device_initialize failed
[    17.774] (II) [KMS] Kernel modesetting enabled.
[    17.774] (EE) AMDGPU(1): amdgpu_device_initialize failed
[    17.774] (EE) Screen 0 deleted because of no matching config section.
[    17.775] (II) UnloadModule: "amdgpu"
[    17.775] (EE) Screen 0 deleted because of no matching config section.
[    17.775] (II) UnloadModule: "amdgpu"
[    17.775] (EE) Device(s) detected, but none match those in the config file.

So the questions are:

1. Isn't this suppose to work on this processor? I read the AMDGPU driver supports Sea Islands GCN GPU.

2. The system is working seemingly fine. X is starting and working. How can I check which graphics driver X is using?

3. How do I fix the amdpgu_device_initialize failed messages?

Thanks!

UPDATE:

According to user experiences A10-7870K should work fine with AMDGPU-PRO
https://www.phoronix.com/forums/forum/linux-graphics-x-org-drivers/amd-linux/873464-amdgpu-pro-beta-2-driver-is-playing-nicely-on-ubuntu-16-04-with-the-r9-fury?p=874788#post874788
Not that I could install it, it gives some dependency errors. I think it may help if I can install amdgpu-pro but it seems impossible! The error below is from amdgpu-pro-16.60-379184

The following packages have unmet dependencies:
 amdgpu-pro : Depends: libvdpau-amdgpu-pro but it is not going to be installed
              Depends: clinfo-amdgpu-pro but it is not going to be installed
 amdgpu-pro-dkms : Depends: dkms (>= 1.95) but it is not going to be installed
 amdgpu-pro-lib32 : Depends: libdrm-amdgpu-pro-amdgpu1:i386
                    Depends: libgbm1-amdgpu-pro:i386
                    Depends: libgl1-amdgpu-pro-glx:i386
                    Depends: libgl1-amdgpu-pro-dri:i386
                    Depends: libgles2-amdgpu-pro:i386
                    Depends: vulkan-amdgpu-pro:i386
                    Depends: libvdpau-amdgpu-pro:i386
                    Depends: libopencl1-amdgpu-pro:i386
                    Depends: opencl-amdgpu-pro-icd:i386
E: Unable to correct problems, you have held broken packages.

Now I have also made a question at AMD forums for this driver installation failure:
https://community.amd.com/message/2784212