I have a file /etc/default/capemgr. I'm not sure of its intended use. But the contents in my Sep Jessie Debian are:

It's was fixed via: "bb-customizations"

Which has a script to push all *.dtbo's into the initrd.img



So, this happens when you're building an image, not at startup?

For background, go read up on the systemd/udev vs kernel.org firmware
loading "issue" that cropped up around v3.9/etc..

The issue has been resolved in an initramfs hook, (see link above),
the failsafe /etc/init.d/capemgr.sh script isn't needed anymore, but
left for users that use it.