make your own file with a .conf extension in /etc/modprobe.d/ such as /etc/modprobe.d/radeon.conf and inside of it put
options radeon modeset=0
then sudo update-initramfs -u and reboot.
make your own file with a .conf extension in /etc/modprobe.d/ such as /etc/modprobe. d/radeon. conf and inside of it put
options radeon modeset=0
then sudo update-initramfs -u and reboot.