[Bug 80500] New: Flickering shadows in unreleased title trace

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80500

          Priority: medium
            Bug ID: 80500
          Assignee: idr at freedesktop.org
           Summary: Flickering shadows in unreleased title trace
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: courtney at lunarg.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 10.2
         Component: Drivers/DRI/i965
           Product: Mesa

Created attachment 101697
  --> https://bugs.freedesktop.org/attachment.cgi?id=101697&action=edit
Experimental patch that appears to work around flickering shadows issue.

Shadows are intermittently disappearing during trace playback. The effect is
random (run to run), but consistent (within a run).  We’ve triaged to the point
we believe it has to do with uniform buffer update timing or caching. 
Inserting a batch buffer flush only for glBufferSubData with GL_UNIFORM_BUFFER
circumvents the issue, but we do not considered it a fix.  It does hack around
it with no performance loss.  More research is needed to find real root cause.

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