Comment 3 for bug 1837209

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).