Sorry I was on leave and didn't notice how many questions needed
answering:

> It may be obvious to you that it's safe to remove /dev/dri/card0 (see
comment #71), but it's not clear to me what creates that device, why,
and when.

The device is created by whatever DRM driver loads first. The fix works
by verifying it is simpledrm before deleting anything:

  TEST=="/sys/devices/platform/simple-framebuffer.0/drm/card0",
RUN+="/bin/rm /dev/dri/card0"

> Also, the test plan still does not cover non-nvidia platforms, and it
sounds to me like that would be crucial.

Actually no. Testing for all the possible regressions on unrelated
platforms is not something we do in SRU testing. And that's just
conflating the test plan now.

> Finally, don't systems with multiple video cards exist, and couldn't
one be using /dev/dri/card0?

As mentioned above, the fix works by verifying it is owned by simpledrm
before deleting anything.

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https://bugs.launchpad.net/bugs/2060268

Title:
  Phantom "Unknown Display" shown in Settings after installing the
  Nvidia driver

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