Owen Taylor has written a detailed update about his ongoing work on compositor frame timing (to which we provided an introduction back in August). This time, the issue at hand is coping with video playback or other sources that need a fixed frame rate not equal to the display's refresh rate. "I’m pretty happy with how this algorithm works out in testing, and it may be as good as we can get for X. The main downside I know of is that it only individually solves the two problems – handling clients that need all the rendering resources of the system and handling clients that want minimum jitter for displayed frames, it doesn’t solve the combination."
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