The value don't change even when the luminosity changed it stay stuck on 400 cat /sys/bus/acpi/devices/ACPI0008:00/iio\:device0/in_illuminance_raw 400 udevadm info --export-db | grep iio:device0 P: /devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0008:00/iio:device0 N: iio:device0 E: DEVNAME=/dev/iio:device0 E: DEVPATH=/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0008:00/iio:device0 I open a bug for iio-sensor-proxy and its an driver issue so i'm here to help to fix this https://github.com/hadess/iio-sensor-proxy/issues/214