Video tearing on external monitor

I'm trying to get video playback on an external monitor which is connected via HDMI.  It all works but the vsync signal seems to be coming from the internal monitor (laptop computer).
Is there any simple solution to this?  The two monitors have the same refresh rate, but that seems to just make the tearing appear as a line the slowly moves up the screen.  Is it possible to tell the application (totem in this example) which monitor to take the vsync signal from?
For what it's worth, I'm using intel graphics and the most of the videos I'm watching is being decoded via vaapi in totem (gstreamer).

*Everyone* will have this issue, regardless of hardware or driver. It's not possible to sync to two displays unless their timings are exactly the same. And by that I don't mean just resolution and refresh rate, I mean all timings.
nvidia-settings allows you to choose which display video should be synced to. The other display (unless it's completely identical) will have tearing. No way around it. I think the Catalyst Control Center has such a setting too, I can't remember, all I remember is my friend uses Catalyst and we were playing around a bit trying to remove tearing on his TV. No idea if open source drivers provide such a setting.

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