The commands below are known to work with Fedora Linux 35
sudo dnf install make kernel-devel dkms
lsmod | grep fake
dmesg | grep fake
sudo modprobe fake_dp_dual_mode
sudo rmmod fake_dp_dual_mode
# sudo dkms build fake_dp_dual_mode/1.0.1 -c ./fedora/dkms.conf
sudo dkms install fake_dp_dual_mode/1.0.1 -c ./fedora/dkms.conf
ls /usr/src/fake_dp_dual_mode-1.0.1/