J have the same problems.
Notebook HP Pavilion 17-g164ng, AMD A10-8780P APU, Kubuntu 16.04.1, UEFI.
Nomodeset - 800x600 -is no solution for working. 
When starting life-system from USB, CSM, nomodeset I get  otimal resolution - 
can not be changes. 
But CSM-mode installation is option.

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  AMDGPU Black Screen when Booting

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