1. Edit /boot/config.txt and add below codes.
dtparam=i2c1=on
dtparam=i2c_arm=on
2. Edit /etc/modules-load.d/raspberrypi.conf and add below code.
i2c-dev
3. install package
pacman -S i2c-tools
4. enable oled-service
systemctl enable --now kvmd-oled kvmd-oled-reboot kvmd-oled-shutdown
5. reboot
reboot now