Some pre-boot features only work with UMA graphics today on Windows based system. Displays on
docks may be driven by either the UMA or Discrete Graphics. In order to support pre-boot features
on displays attached through the dock, platforms with discrete GPU will need to switch to UMA
graphics during pre-boot. A possible mechanism for this switch is using display multiplexers. We
propose a method that reduces the number of required multiplexers, saving cost and board space.
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INC, HP, "COST SAVING BY REDUCING ONE OF THE MULTIPLEXERS REQUIRED TO ENABLE DOCKED PRE-BOOT EXTERNAL DISPLAY SUPPORT", Technical Disclosure Commons, (January 24, 2020)