I believe I am experiencing this on 20.04

> (EE) open /dev/dri/card0: No such file or directory

The problem seems to be that gdm-wait-for-drm doesn't work for (muxless)
dual GPU laptops when using the dGPU.

GDM will start when only card1 is available, *both* card0 and card1 need
to be available before starting X.

(As a quick hack, I am using `ExecStartPre=/bin/sleep 1` to give drm
enough time before starting GDM.)

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https://bugs.launchpad.net/bugs/1925344

Title:
  [nvidia] Session not started after reboot (black screen) - requires
  switching tty back and forth

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