https://bugs.kde.org/show_bug.cgi?id=316734

--- Comment #7 from Josef Kufner <[email protected]> ---
Can't it be because of double/tripple buffering? If only the first frame is
really rendered, the other half of the buffer will still contain previous
screen and after resume the buffers may not be swapped correctly, and if it
takes a while to redraw... What if the screen is cleared twice with a sync both
in between and after? (Just a wild guess.)

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