[Mesa-dev] [Bug 106536] glXWaitVideoSyncSGI blocks forever

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106536

            Bug ID: 106536
           Summary: glXWaitVideoSyncSGI blocks forever
           Product: Mesa
           Version: 18.0
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: GLX
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: geoff at hostfission.com
        QA Contact: mesa-dev at lists.freedesktop.org

Before mesa 18.0 glXWaitVideoSyncSGI worked perfectly, but after updating to
mesa 18 it blocks forever, see the following for the code exhibiting this
behavior.

https://github.com/gnif/LookingGlass/blob/da2bcfdf9a3d559928a450cfc4642e8635c8f71f/client/renderers/opengl.c#L433

We have seen this occur on AMD hardware, I personally can reproduce it on a
Vega 56. It may affect other platforms but I can not confirm.

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