I have Windows 8.1 with Directx11 on a laptop
Display graphic adatper is a Intel HD 4600
3D graphic adapter: NVidia 840M
The first monitor is the laptop monitor, and i use a second monitor with rgba cable.
In the unity editor, when i play the game (test mode), and the GAME window on the second monitor, the mouse position is incorrect. Can’t move the mouse to the left side of the screen, because the unity(?) rewrite the position and drop back. Similar situation when i clicking, the mouse jump right and up ~100-100 pixel …
Is this in Unity 5? Am I understanding this correctly, you’ve detached the game window from the editor and are running that on a separate monitor from the editor?
If so, I think this is a known issue that there is a problem with doing this.
I guess it must depend on specific set up. This is pretty much how I always work, Game window on second monitor in Windows 8.1 and not seeing any mouse position issues. This is both Unity 4 and 5.