Seamless display migration

A non-transitory machine-readable medium storing instructions that, when executed, cause a machine to perform a method comprising:

• receiving mirrored video display streams from both a first graphics processing unit (GPU) and a second GPU;
• and
• switching a video display stream sent to a display device from the mirrored video display stream from the first GPU to the mirrored video display stream from a second GPU, wherein the switching occurs during a blanking interval for the first GPU that overlaps with a blanking interval for the second GPU, wherein the switching occurs in response to
• determining that the mirrored video display streams for the first GPU and the second GPU do not have an overlapping vertical blanking interval prior to the expiration of a selected vertical blanking interval for the first GPU;
• holding the video display stream sent to a display device in the selected vertical blanking interval of the first display stream for a length of time longer than the selected vertical blanking interval, wherein causing the video display stream to be held in the selected vertical blanking interval comprises decoupling an output of the GMUX from a next frame of an output of the first GPU;
• and
• determining, while the video display stream sent to a display device is being held within the selected vertical blanking interval, that the display stream for the second GPU has entered a vertical blanking interval.