[Intel-gfx] Water mark update need to wait for next VSYNC?

[Xie, William]

Hi all,
 Can anyone educate me if water mark update need to wait for next VSYNC?
In other words, if we flip a frame to overlay for the first time,
it will be showed in the next VBlank as water mark update needs to wait for that?

Is this true or a bug?

Thanks
William
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