Get better refreshRate precision about edidparser HOT 5 CLOSED

EDID is old and limited. Common timing only contains a list of possible refresh rates and sizes, the standard timing table includes more detailed information, but still, the refresh rate is always an integer which means no 59.95 or 59.885. These numbers are then deduced by the driver when generating the expected signal. That's why NVidia and windows know about the real number but here we don't.

However, there is also a new table for detailed timings. This table does not in fact contain the refresh rate, but it has all the info required to calculate the actual refresh rate. All you have to do is to apply this formula:

RefreshRate = PixelClock / ((HorizontalActivePixels + HorizontalBlankingPixels + HorizontalBorderPixels) * (VerticalActivePixels + VerticalBlankingPixels + VerticalBorderPixels))

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for 1920x1200 in your example it is:

(154,000,000 / ((1,920 + 160 + 0) * (1,200 + 35 + 0))) = 59.95017128620367

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read this for more info:
https://glenwing.github.io/docs/VESA-DMT-1.13.pdf

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and here contains a more detailed formula:
https://electronics.stackexchange.com/questions/14828/how-do-i-calculate-needed-pixel-clock-frequency

should give you a better value.

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Thanks for the details :)

Yes I already processed the refreshrate with information coming from DetailedTimingDescriptor

It's works pretty well and I could build the same list of available resolutions as I can find in windows

Have a nice day !

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