DXGI flip model locked to vsync

I found swap chain created with flip model (DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL or DXGI_SWAP_EFFECT_FLIP_DISCARD) was locked to VSync (1/60 sec), calling IDXGISwapChain1::Present1 method with SyncInterval set to 0 as follows doesn't work.

swap_chain->Present1(0, 0, &param);

Does anyone know how to disable VSync for DXGI flip model?

What is your version of Windows 10? UWP and windowed swap chain used to always be locked to VSync, prior to the 1511 build.