when executing: /opt/amdgpu-pro/bin/clinfo
you get:
terminate called after throwing an instance of 'cl::Error'
what(): clGetPlatformIDs
Abgebrochen (Speicherabzug geschrieben)

(2) using command dmesg you see:
4.909396] [drm:amdgpu_init [amdgpu]] *ERROR* VGACON disables amdgpu kernel modesetting.

GRUB Boot: linux /boot/vmlinuz-4-4.0.97 -generic root=UUID=... ro nomodeset text

>> we need to remove the nomodeset and text from the boot parameters,
after that clinfo was running fine

to configure permantent in file: /etc/default/grub

>> after modification auf this file you need to run "update-grub"

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