OK, now the problem is solved. The cause of the tearing artifact on the xSight HMD screen actually comes from the NVIDIA control panel settings. It is the setting of the "Triple buffering" under the "Manage 3D Settings" submenu that matters (refer to the attached screen shot). When set to "On", it will cause the tearing artifact in the xSight HMD. But if set it to "Off", the tearing artifact is gone.
Zhi
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