>  The module can be loaded on boot and then it can (automatically) be
unloaded (at some point) if the GPU is disabled in a hybrid system.

Then I suggest to install an udev rule like

  ACTION=="remove", SUBSYSTEM=="module", DEVPATH=="*/nvidia",
RUN+="/bin/touch /run/nvidia_unloaded"

(this assumes the module is called "nvidia.ko" -- adjust the DEVPATH
match as appropriate) and check whether /run/nvidia_unloaded exists.

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https://bugs.launchpad.net/bugs/1307069

Title:
  gpu-manager causing long startup delays

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