Unfortunately your GPU has reached peak optimisation and legacy status, there will not be any further driver updates. More information available here.
You did not mention which driver you are currently using?
The latest Crimson driver for your system is 16.2.1 and is available here.
The last Catalyst driver for your system in 15.11.1 Beta and is available here.
I would recommend trying both of the above drivers to see if either resolves your issue.
I tried both:
Catalyst Software Suite 15.7.1 29.07.2015
Crimson Edition 16.2.1 Beta 01.03.2016
Energy saving not working with both of them.
@kingfish (below): Everything is working except energy saving - so i'd rather no go back to windows 8.
sorry - i still have to test AMD Catalyst™ 15.11.1 beta...
As Kingfish mentioned, your integrated GPU does not have any compatible drivers for Windows 10. If you want energy saving, you'll need to roll back to a supported OS for your IGPU.
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Your switchable graphics does not support Win10 and will never work correctly. The Intel graphics (Intel HD graphics) are too old. Your best bet is to revert to the OS the laptop was designed for.