[Wayland-bugs] [Bug 79502] New: Weston needs to detect when DRM pageflip timestamps are not supported

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79502

          Priority: medium
            Bug ID: 79502
          Assignee: wayland-bugs at lists.freedesktop.org
           Summary: Weston needs to detect when DRM pageflip timestamps
                    are not supported
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: ppaalanen at gmail.com
          Hardware: All
            Status: NEW
           Version: 1.5.0
         Component: weston
           Product: Wayland

When the DRM pageflip timestamps are not supported, it seems the DRM pageflip
events carry zero as the timestamp, and probably also the vblank counter does
not work. Weston needs to detect this situation and abort.

All animation in Weston rely on the pageflip timestamp, including the fade-in.
If the timestamps do not work, the fade-in never advances, leaving the screen
black. This also affects applications through the frame callback argument, and
makes the future Presentation extension useless.

The situation was encountered in bug #75761.

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