Can you paste the output of `ls -al /sys/bus/i2c/devices/*/` (with the tailing '/') and `ls /sys/bus/acpi/devices`. If there is an I2C device for it, then it should be listed.
Can you paste the output of `ls -al /sys/bus/ i2c/devices/ */` (with the tailing '/') and `ls /sys/bus/ acpi/devices` . If there is an I2C device for it, then it should be listed.