Public bug reported:

If you selected "nvidia" (performance) mode in the past, selecting on-
demand mode will not remove the xorg configuration file, and the NVIDIA
GPU will remain the primary GPU (whereas the integrated GPU should be
the primary one).

DISPLAY=:1 __NV_PRIME_RENDER_OFFLOAD=0 __GLX_VENDOR_LIBRARY_NAME=""
glxinfo | grep renderer

OpenGL renderer string: Quadro T2000 with Max-Q Design/PCIe/SSE2

** Affects: ubuntu-drivers-common (Ubuntu)
     Importance: High
     Assignee: Alberto Milone (albertomilone)
         Status: In Progress

** Changed in: ubuntu-drivers-common (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1900137

Title:
  PRIME on demand mode uses the wrong GPU

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