Dear list,

I'm writing a program that needs to synchronize with
the vertical refresh of the screen in order to trigger
an external piece of hardware.  Is there a way through
Xlib to detect when a vertical refresh has happened? 
Or is this something that is video card driver
pecific?

I'm running XF86 4.1 with a nVidia Quadro 950 card.

Thanks,
David

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