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1º Reinstall the amdgpu-pro.
(make sure that no error pop-up)
2º Open Terminal and type $ xrandr
(it will show your capable resolutions, refresh rate and output)
3º Go to settings/resolutions in control panel and change the resolution for other resolution like 800x600.
(this is for creating a file called "monitors.xml" in ../.config/..)
4º In the Terminal type $ sudo xrandr --output HDMI1 --mode XXXXxXXXX --rate XX
(on output, make sure that you know what it is, it can be HDMI-A-1, or DVI1, or whatever...)
(on XXX type your values)
(if is done right the screen will flash and you will see what you want)
5º Go to "Home" press Ctrl+h to show hidden folders, go to ".config" and find the file "monitors.xml" and open with gedit.
6º In the line "<rate>60</rate>" change for your monitor refresh rate and save.
7º reboot the system and done, it should be running fine and smooth.
Thank you very much for your guide. I did not managed to fix it that way, since for some reason I am unable to guess my HDMI name .
But i did thanks to Michael Larabel from phoronix.com for providing Kernel build. It fixed my problem ( I have now full resolution but still not 3D acceleration) , and I can now wait for kernel 4.15 to get card fully utilized. Unless there is better way.