[mythtv] DRM VSync

[Doug Larrick]

Ivor Hewitt wrote:
> Would it be more accurate for mythtv to actually time the drm sync
> interval to establish the refresh rate rather than use the refresh rate
> reported by X? or does it just use that value as a guide?

Probably not.  Reading what's specified to the hardware should be more
precise, if not more accurate, than measuring observed behavior.
Measuring would also only work for those few vsync methods that can
actually sync to the hardware.

-Doug
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