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- Option "TearFree" "boolean": disable or enable TearFree updates. This option forces X to perform all rendering to a back buffer before updating the actual display. It requires an extra memory allocation the same size as a framebuffer, the occasional extra copy, and requires Damage tracking. Thus, enabling TearFree requires more memory and is slower and introduces a small amount of output latency, but it should not impact input latency. However, the update to the screen is then performed synchronously with the vertical refresh of the display so that the entire update is completed before the display starts its refresh. That is only one frame is ever visible, preventing an unsightly tear between two visible and differing frames. This replicates what the compositing manager should be doing, however, TearFree will redirect the compositor updates directly onto the scan out thus incurring no additional overhead in the composited case. Not all compositing managers prevent tearing, and if the outputs are rotated, there will still be tearing without TearFree enabled. (en)
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