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In some hardware configurations, presentation timestamps could be missing from some page flip events, leading to a temporary loss of vblank synchronization. This occurs at least with AMD GPUs for atomic commits that only update the cursor plane. [0] In those cases, it's better to calculate the next update time according to the last valid presentation timestamp instead of relying on the dispatch lateness. [0] https://gitlab.freedesktop.org/drm/amd/-/issues/2030 Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2481>