/etc/init/udev-fallback-graphics.conf is in udev 204-5ubuntu20.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | # fallback-graphics - take actions to initiate fallback graphics
#
# if we have cold plugged everything and not yet seen a valid graphics
# device,
# shove a fallback framebuffer into the mix and hope for the best.
description "load fallback graphics devices"
# We only want this job to happen once per boot, hence 'startup and ...'.
start on (startup and
(graphics-device-added PRIMARY_DEVICE_FOR_DISPLAY=1
or drm-device-added PRIMARY_DEVICE_FOR_DISPLAY=1
or stopped udevtrigger or container))
task
script
if [ "$PRIMARY_DEVICE_FOR_DISPLAY" = "" ]; then
modprobe -q -b vesafb
fi
end script
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