After some more research I found out that this is actually due to an
unimpelmented feature in Nvidia's drivers.
On this model of laptop, the video output ports all connect directly to
the discrete Nvidia GPU, and Nvidia's drivers do not yet support the GPU
being used as a sink from the integrated GPU and piping the integrated
GPU's output to a display.
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which is subscribed to nvidia-graphics-drivers in Ubuntu.
https://bugs.launchpad.net/bugs/1849214
Title:
"nvidia on-demand" mode does not support external displays
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https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/1849214/+subscriptions
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