Does XFree86 video driver support VBlank(Vsync) interrupt? If it does, how to enable it?
I know some librarys offer function calls to sync to Vsync (linke SDL_Flip), but they use
polling instead Vsync interrupt. The performance suffers a lot.
 
I did some experiment by probing the vidoe interrupt pin on the AGP VGA card. It's active
under MS Windowns but not Linux. I just don't know why Linux doesn't support a basic and vital
function like vsync interrupt?
 

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