No warnings/errors but also no displays detected in Ubuntu 24.04

Steps to reproduce

# master "Merge branch 'linux_6_8' into 'master'" 3eb20df68a545d07b8501f13fa9d20e9c6f577ed
git clone git@gitlab.com:ddcci-driver-linux/ddcci-driver-linux.git
cd ddcci-driver-linux
sudo make -f Makefile.dkms install
sudo modprobe ddcci dyndbg

sudo dmesg

[   12.423403] ddcci: loading out-of-tree module taints kernel.
[   12.423419] ddcci: module verification failed: signature and/or required key missing - tainting kernel
[   12.426925] ddcci: initializing ddcci driver
[   12.426945] ddcci: ddcci driver initialized

ls /sys/bus/ddcci/devices

(exists but empty)

ls /sys/bus/ddcci

devices  drivers  drivers_autoprobe  drivers_probe  uevent

ls /dev/bus/ddcci

ls: cannot access '/dev/bus/ddcci': No such file or directory

Using default kernel linux-image-6.8.0-35-generic.

The displays are connected through DP and HDMI, they offer working DDC/CI.

Calling following commands leads to detection

echo 'ddcci 0x37' | sudo tee /sys/bus/i2c/devices/i2c-3/new_device

The issue might be already described in this comment.