Upon launching ArmA 3 from the launcher (after being launched from Steam), the game crashes and I get this error:
Cannot create DX11 device:
Adapter (NVIDIA GeForce GTX 860M ) Fullscreen Resolution 1920x1080, format R8G8B8A8_UNORM, refresh 60
Hz
Error DXGI_ERROR_UNSUPPORTED
{F27355}