so like, after the upgrade to windows 10 my computer which uses an amd apu and gpu has been weird
basically what's wrong is amd dual graphics:

it's not working with a few games when it's enabled (games like assassins creed 4, space engineers and civilization 5) and it used to work with these games on windows 8. it works fine with other games though, but when it's disabled it makes those games work slower (for obvious reasons)
does anyone know why it won't work with a few on windows 10? sorry if I'm being really vague but it would help if I had an understanding of why this occurs