the overlay is needed for mir-kiosk to allow it to work at all
(unaccelerated though)

to have mir-kiosk fully accelerated one needs to use -kms-v3d instead
but this in turn disables all video decoding in the vc4 core. i
originally picked -fkms-v3d for the gadget since it is the least evil
(makes mir semi-work while still allowing to use omxplayer accelerated
(see the omxplayer-pi snap for testing)).

long term it would be really cool if the graphics overlay selection
could be a bit more dynamic (this is indeed orthogonal to this bug
though) without the need to hardcode such stuff on boot or if mir-kiosk
could simply work on top of vc4 without need for the overlay (the mir
team was looking into that but i do not know the current status).

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https://bugs.launchpad.net/bugs/1837209

Title:
  Splash screen fails to display on recent pi core18 images

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