Multiple users have reported building ddcutil for the Raspberry Pi and successfully running it. One user reported that the following settings were required in file /boot/config.txt in order to enable the I2C buses:
dtparam=i2c0=on dtparam=i2c1=on dtparam=i2c_vc=on dtparam=i2c_arm=on dtparam=i2c2_iknowwhatimdoing=yes
Note that there are no prebuilt packages for the Raspberry Pi, which uses an ARM processor. ddcutil must be built from source.